1.material:rubber,NBR 2.color:black 3.certification:ISO9001,ROHS,FDA 4. ... :3000pcs Desprition: Itemwaterproof national o-ring Size customized size Material 100% Rubber ,also can be EPDM,NR Usageuse for sealing Color any ... production within 15 days,Production within one week Features:1.100%manufacturer with more than 13years' experience2.ISO9001-2000 and ROHS ...