Self Adhesive Square Black Castle Rubber Feet Bumpers 0.51"(13mm)DX0.25"(6.4mm)H (20 pkg) .51" (13mm) in diameter x .25" (6.4mm) height (approx) 1 sheet X 20pcs laptop rubber feet Peel off backing to use tapezoid shape Provides a non-slip, non-scratch surface