... OEM,ODM available ISO9001,SGS,ROHS Lead time:30 Day transparent black and blue o ring 1)Applicable material:Silicone,NR ... ,NBR,SBR,EPDM,CR,TPE,PVR,PC,PE,PP,PS,POM,PUR,PVC,PPTV,HIPS,ABS,EPE,EVA etc ... help you modify your enigine for race tolerances and performance. transparent black and blue o ring