The set contains six 38 mm lenses, one each of double convex, plano-convex, concavo-convex, double concave, plano-concave, and convexo-concave lens. Includes an activity guide and a reusable cardboard storage box. Additional Info: The set contains six 38 mm lenses, one each of double convex, plano-convex, concavo-convex, double concave, plano-concave, and convexo-concave lens. Includes an activity guide and a reusable cardboard storage box. Package Size(L x W x H): 7.5 X 7 X 1 (IN) Categories: Optics, Lenses HTS Code: 9001.90.4000 UNSPSC: 3.12415e+007 Country Of Origin: INDIA