Transport and storage box with inside membranes Two membrane foils hold the contents gently and well visible Safety lock No rattling due to two membrane foils gently holding even smallest pieces Stackable Small: Set of 12 for crowns, inlays etc - (W x H x D) 4 x 1.9 x 4 cm XXL: for two models, stackable, - (W x H x D) 19.2 x 4.8 x 9.2 cm