Molded of non-combustible mar-proof material. Available in 'SP' series in Standard, Junior-Jumbo, and Jumbo sizes. Seven standard colors available -- Ivory, White, Brown, Gray, Black, Red, and Light Almond. Individually wrapped with color-matching screws. Resistant to discoloration, grease, oil, solvent, and moisture. Nominal thickness, .070 inch. For covering patents.