Have you seen the fantastic Birthday board ideas on Pinterest? These wooden discs with pre-drilled holes are perfect for that project. They also work great for jewelry making.
:: Unfinished wood discs with two holes pre-drilled into the top & bottom of the disc
:: Each disc measures 1.5" (3.8cm) in diameter and are 1/8" (3mm) tall with a 1/8" diameter hole
:: Sanded smooth
3/4" S-Hooks sold separately here.