1.Meterialof nylon rubber washer,nylon 2.Hardness,Durometer 30-90 Shore A 3.Color:transparent With FDA approval flat washers 1. Material: Silicone, EPDM, NR, NBR, SBR, CR, IR, IIR, FPM, PVC, ABS and so on. 2. Hardness: Durometer 30-90 Shore A 3. Size: The same as your design, drawing or sample. 4. Color: Black, white, Transparent, gray, green, yellow, blue, red etc. 5. Logo & Printing: According ...