diff --git a/MatterControlLib/PartPreviewWindow/PartTabPage.cs b/MatterControlLib/PartPreviewWindow/PartTabPage.cs
index aba343812..f5e653f0a 100644
--- a/MatterControlLib/PartPreviewWindow/PartTabPage.cs
+++ b/MatterControlLib/PartPreviewWindow/PartTabPage.cs
@@ -160,8 +160,8 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
 			leftBar.AddChild(new VerticalSpacer());
 
-			var expandedImage = AggContext.StaticData.LoadIcon("expand.png", 18, 18, theme.InvertIcons);
-			var collapsedImage = AggContext.StaticData.LoadIcon("collapse.png", 18, 18, theme.InvertIcons);
+			var expandedImage = AggContext.StaticData.LoadIcon("expand.png", 16, 16, theme.InvertIcons);
+			var collapsedImage = AggContext.StaticData.LoadIcon("collapse.png", 16, 16, theme.InvertIcons);
 
 			var expandBarButton = new IconButton(expanded ? collapsedImage : expandedImage, theme)
 			{
diff --git a/StaticData/Icons/collapse.png b/StaticData/Icons/collapse.png
index 91368833f..4aba52a00 100644
Binary files a/StaticData/Icons/collapse.png and b/StaticData/Icons/collapse.png differ
diff --git a/StaticData/Icons/expand.png b/StaticData/Icons/expand.png
index 2813767ff..ed7fc96e9 100644
Binary files a/StaticData/Icons/expand.png and b/StaticData/Icons/expand.png differ