1.material:teflon ,ptfe,rubber,nbr,ect 2.various size and color 3.type or structure:TC, TB, SC,ect 4.certificate:ISO2001 teflon flat washer describle:1. Material: teflon,NBR, SILICONE, VITON,HNBR, CR, PTFE, EPDM, etc. Can choose on your requirement;2. types: TC, TB, TA, SC, SB, SA, VC, VB, VA, KC, KB, KA, DC, DB etc, 3. High resistance to chemical agents and solvents 4. Different sizes of Oil ...