The 24 Compartment Tray is made of plastic with a clear plastic "Easy Out" sliding cover that won't come off even if dropped.  In addition, each compartment is equipped with a rounded front edge to make retrieving beads and other small items easy.

Overall Dimensions: 5" x 7-3/4" x 7/8"

Compartment Dimensions: 1-1/8" x 1-3/16" x 5/8"