diff --git a/Libraries/SPTarkov.Server.Core/Helpers/ItemHelper.cs b/Libraries/SPTarkov.Server.Core/Helpers/ItemHelper.cs
index d9592591..a78f3ce3 100644
--- a/Libraries/SPTarkov.Server.Core/Helpers/ItemHelper.cs
+++ b/Libraries/SPTarkov.Server.Core/Helpers/ItemHelper.cs
@@ -1,9 +1,9 @@
 using System.Collections.Frozen;
-using System.Text.Json.Serialization;
 using SPTarkov.DI.Annotations;
 using SPTarkov.Server.Core.Models.Eft.Common;
 using SPTarkov.Server.Core.Models.Eft.Common.Tables;
 using SPTarkov.Server.Core.Models.Enums;
+using SPTarkov.Server.Core.Models.Spt.Inventory;
 using SPTarkov.Server.Core.Models.Utils;
 using SPTarkov.Server.Core.Services;
 using SPTarkov.Server.Core.Utils;
@@ -1431,7 +1431,7 @@ public class ItemHelper(
     /// <param name="items">Item with children</param>
     /// <param name="rootItemId">The base items root id</param>
     /// <returns>ItemSize object (width and height)</returns>
-    public ItemSize GetItemSize(List<Item> items, string rootItemId)
+    public ItemSize GetItemSize(ICollection<Item> items, string rootItemId)
     {
         var rootTemplate = GetItem(items.Where(x => x.Id.Equals(rootItemId, StringComparison.OrdinalIgnoreCase)).ToList()[0].Template).Value;
         var width = rootTemplate.Properties.Width;
@@ -2244,20 +2244,3 @@ public class ItemHelper(
             .ToArray();
     }
 }
-
-public class ItemSize
-{
-    [JsonPropertyName("width")]
-    public int Width
-    {
-        get;
-        set;
-    }
-
-    [JsonPropertyName("height")]
-    public int Height
-    {
-        get;
-        set;
-    }
-}
diff --git a/Libraries/SPTarkov.Server.Core/Models/Spt/Inventory/ItemSize.cs b/Libraries/SPTarkov.Server.Core/Models/Spt/Inventory/ItemSize.cs
new file mode 100644
index 00000000..10c9ecf3
--- /dev/null
+++ b/Libraries/SPTarkov.Server.Core/Models/Spt/Inventory/ItemSize.cs
@@ -0,0 +1,20 @@
+using System.Text.Json.Serialization;
+
+namespace SPTarkov.Server.Core.Models.Spt.Inventory;
+
+public record ItemSize
+{
+    [JsonPropertyName("width")]
+    public int Width
+    {
+        get;
+        set;
+    }
+
+    [JsonPropertyName("height")]
+    public int Height
+    {
+        get;
+        set;
+    }
+}