Moulding size:3/4" inch width x 1 5/8 inch deep(18x40mm): standard stretch bar, you can choose fir wood or pine wood.

standard stretch stretch bar stretch accessary of stretch bar

Moulding size:1 1/2" inch deep x 2 inch width(38x50mm): used for gallery warp,you can choose fir wood or pine wood.

gallery wrap series gallery wrap 2 stretch for gallery