I purchased 1/4'' 6.4 mm wood, any size and type of wood will do. It depends on how big you want your display or how many pairs of post earrings you own.You can copy and paste more holes if needed. You can also do this with plexi however i don't due to fingerprints.I cut all three pieces and its done,simple as that! No screws no glue or any other materials needed. Enjoy! I made it at tech shop!