The perfect fastener for smooth, non-porous surfaces: glass, tile, glazed porcelain, fiberglass. The perfect assortment for lots of classroom uses. Each pack includes: 6 Mini Cups 3/4 inches hold up to 1/2 pound each, 4 Small Cups 1 1/8 inches hold up to 1 pound each, and 2 Medium Cups 1 3/4 inches hold up to 3 pounds each.