White nylon plastic with a matte finish and slight grainy feel.
About this Product
Bottom half of paper magnet puzzle. I have not tested this part yet (but I did create and test the previous version, so this should work). Look at the top half for assembly details. The previous version was not tight enough for my liking so this one is made tighter, and thus might have to be slightly sanded in the shaded blue region on the second picture.