Please see the usage instructions in . Scratch resistant, light weight, autoclavable, well contoured and matte finish. It includes C4A, C4B, C4C,C4D for adults and C2A and C2B for Children. A complete set that includes the black screens for upper lower arches of adult and children teeth. All the six screens are packed in a cassette to avoid the scratches in autoclave.Best Sellers Rank: See Top 100 in Health & Household. : B07Z27LCMD. Manufacturer: Wise Linkers LLC. Date First Available: June 3, 2019. Package Dimensions: 10.04 x 5.71 x 1.89 inches; 1.34 Pounds.