Sandtastik Preschool Craft Colored ICE Real Glass Gems, Scatters 10 lb (4.5 kg) Box; 4 - 10 mm - Coral Real Glass. Tumbled to smooth all edges, safe to handle with your hands. Pieces will sink in water. Size/Pc: 4 - 10 mm. Age: 8 Plus (adult supervision). Item Dimensions: 10"Lx10"Wx5"H. Actual Item Weight: 10 lb. Color: Coral.