Prism Specification:30mm*30mm*15mm Scratch/Dig:40/20 Tolerance:1' Our main products include lens made by : 1. various kinds of crystal materials, such as ZnSe, CaF2, Ge, Si, ZnS, BaF2, GaAs, MgF2, LiF, Copper Mirrors, Mo, Sapphires, Quartzs, Ceramics , YAG, etc 2. various kinds of glasses material including crown glass, flint glass, lanthanum glass, etc. Our products can service you well in military area or medical, photoelectric, telecom, etc. We can make special order according to your special require on both making or repairing.