diff --git a/mpt_api_client/http/async_client.py b/mpt_api_client/http/async_client.py
index 281c55e..7881af8 100644
--- a/mpt_api_client/http/async_client.py
+++ b/mpt_api_client/http/async_client.py
@@ -27,7 +27,7 @@ def __init__(
         *,
         base_url: str | None = None,
         api_token: str | None = None,
-        timeout: float = 5.0,
+        timeout: float = 10.0,
         retries: int = 5,
     ):
         api_token = api_token or os.getenv("MPT_TOKEN")
diff --git a/mpt_api_client/http/client.py b/mpt_api_client/http/client.py
index 96a49fe..f244b68 100644
--- a/mpt_api_client/http/client.py
+++ b/mpt_api_client/http/client.py
@@ -40,7 +40,7 @@ def __init__(
         *,
         base_url: str | None = None,
         api_token: str | None = None,
-        timeout: float = 5.0,
+        timeout: float = 10.0,
         retries: int = 5,
     ):
         api_token = api_token or os.getenv("MPT_TOKEN")
diff --git a/mpt_api_client/resources/catalog/products.py b/mpt_api_client/resources/catalog/products.py
index 268561f..73f868b 100644
--- a/mpt_api_client/resources/catalog/products.py
+++ b/mpt_api_client/resources/catalog/products.py
@@ -28,6 +28,10 @@
     AsyncItemGroupsService,
     ItemGroupsService,
 )
+from mpt_api_client.resources.catalog.products_items import (
+    AsyncProductItemService,
+    ProductItemService,
+)
 from mpt_api_client.resources.catalog.products_media import (
     AsyncMediaService,
     MediaService,
@@ -72,6 +76,12 @@ class ProductsService(
 ):
     """Products service."""
 
+    def items(self, product_id: str) -> ProductItemService:  # noqa: WPS110
+        """Return product items service."""
+        return ProductItemService(
+            http_client=self.http_client, endpoint_params={"product_id": product_id}
+        )
+
     def item_groups(self, product_id: str) -> ItemGroupsService:
         """Return item_groups service."""
         return ItemGroupsService(
@@ -129,6 +139,12 @@ class AsyncProductsService(
 ):
     """Products service."""
 
+    def items(self, product_id: str) -> AsyncProductItemService:  # noqa: WPS110
+        """Return product items service."""
+        return AsyncProductItemService(
+            http_client=self.http_client, endpoint_params={"product_id": product_id}
+        )
+
     def item_groups(self, product_id: str) -> AsyncItemGroupsService:
         """Return item_groups service."""
         return AsyncItemGroupsService(
diff --git a/mpt_api_client/resources/catalog/products_items.py b/mpt_api_client/resources/catalog/products_items.py
new file mode 100644
index 0000000..7b8dba0
--- /dev/null
+++ b/mpt_api_client/resources/catalog/products_items.py
@@ -0,0 +1,34 @@
+from mpt_api_client.http import AsyncService, Service
+from mpt_api_client.http.mixins import (
+    AsyncCollectionMixin,
+    AsyncGetMixin,
+    CollectionMixin,
+    GetMixin,
+)
+from mpt_api_client.resources.catalog.items import Item
+
+
+class ProductItemServiceConfig:
+    """Product Item service configuration."""
+
+    _endpoint = "/public/v1/catalog/products/{product_id}/items"
+    _model_class = Item
+    _collection_key = "data"
+
+
+class ProductItemService(
+    GetMixin[Item],
+    CollectionMixin[Item],
+    Service[Item],
+    ProductItemServiceConfig,
+):
+    """Product Item service."""
+
+
+class AsyncProductItemService(
+    AsyncGetMixin[Item],
+    AsyncCollectionMixin[Item],
+    AsyncService[Item],
+    ProductItemServiceConfig,
+):
+    """Product Item service."""
diff --git a/tests/unit/http/test_async_client.py b/tests/unit/http/test_async_client.py
index 9ecb143..7e823a8 100644
--- a/tests/unit/http/test_async_client.py
+++ b/tests/unit/http/test_async_client.py
@@ -33,7 +33,7 @@ def test_async_http_initialization(mocker):
             "Authorization": "Bearer test-token",
             "Accept": "application/json",
         },
-        timeout=5.0,
+        timeout=10.0,
         transport=mocker.ANY,
     )
 
@@ -53,7 +53,7 @@ def test_async_env_initialization(monkeypatch, mocker):
             "Authorization": f"Bearer {API_TOKEN}",
             "Accept": "application/json",
         },
-        timeout=5.0,
+        timeout=10.0,
         transport=mocker.ANY,
     )
 
diff --git a/tests/unit/http/test_client.py b/tests/unit/http/test_client.py
index 041ab6d..23b0c1a 100644
--- a/tests/unit/http/test_client.py
+++ b/tests/unit/http/test_client.py
@@ -22,7 +22,7 @@ def test_http_initialization(mocker):
             "User-Agent": "swo-marketplace-client/1.0",
             "Authorization": "Bearer test-token",
         },
-        timeout=5.0,
+        timeout=10.0,
         transport=mocker.ANY,
     )
 
@@ -41,7 +41,7 @@ def test_env_initialization(monkeypatch, mocker):
             "User-Agent": "swo-marketplace-client/1.0",
             "Authorization": f"Bearer {API_TOKEN}",
         },
-        timeout=5.0,
+        timeout=10.0,
         transport=mocker.ANY,
     )
 
diff --git a/tests/unit/resources/catalog/test_products.py b/tests/unit/resources/catalog/test_products.py
index b3ef2d1..e119254 100644
--- a/tests/unit/resources/catalog/test_products.py
+++ b/tests/unit/resources/catalog/test_products.py
@@ -15,6 +15,10 @@
     AsyncItemGroupsService,
     ItemGroupsService,
 )
+from mpt_api_client.resources.catalog.products_items import (
+    AsyncProductItemService,
+    ProductItemService,
+)
 from mpt_api_client.resources.catalog.products_media import (
     AsyncMediaService,
     MediaService,
@@ -66,6 +70,7 @@ def test_async_mixins_present(async_products_service, method):
 @pytest.mark.parametrize(
     ("service_method", "expected_service_class"),
     [
+        ("items", ProductItemService),
         ("item_groups", ItemGroupsService),
         ("parameter_groups", ParameterGroupsService),
         ("media", MediaService),
@@ -85,6 +90,7 @@ def test_property_services(products_service, service_method, expected_service_cl
 @pytest.mark.parametrize(
     ("service_method", "expected_service_class"),
     [
+        ("items", AsyncProductItemService),
         ("item_groups", AsyncItemGroupsService),
         ("parameter_groups", AsyncParameterGroupsService),
         ("media", AsyncMediaService),
diff --git a/tests/unit/resources/catalog/test_products_items.py b/tests/unit/resources/catalog/test_products_items.py
new file mode 100644
index 0000000..26ed58f
--- /dev/null
+++ b/tests/unit/resources/catalog/test_products_items.py
@@ -0,0 +1,44 @@
+import pytest
+
+from mpt_api_client.resources.catalog.products_items import (
+    AsyncProductItemService,
+    ProductItemService,
+)
+
+
+@pytest.fixture
+def product_items_service(http_client):
+    return ProductItemService(http_client=http_client, endpoint_params={"product_id": "PRD-001"})
+
+
+@pytest.fixture
+def async_product_items_service(async_http_client):
+    return AsyncProductItemService(
+        http_client=async_http_client, endpoint_params={"product_id": "PRD-001"}
+    )
+
+
+def test_endpoint(product_items_service):
+    result = product_items_service.path == "/public/v1/catalog/products/PRD-001/items"
+
+    assert result is True
+
+
+def test_async_endpoint(async_product_items_service):
+    result = async_product_items_service.path == "/public/v1/catalog/products/PRD-001/items"
+
+    assert result is True
+
+
+@pytest.mark.parametrize("method", ["get", "iterate"])
+def test_methods_present(product_items_service, method):
+    result = hasattr(product_items_service, method)
+
+    assert result is True
+
+
+@pytest.mark.parametrize("method", ["get", "iterate"])
+def test_async_methods_present(async_product_items_service, method):
+    result = hasattr(async_product_items_service, method)
+
+    assert result is True