silicone seal ring 1)FDA silicone 2)various colors 3)custom sealing ring 4)good quality, reasonable price Silicone O Rings Manufactory -High-Quality Rubber Material -ISO 9001:2001 Certification -Delivery Just-in-time -20 years Experience Item nameO-Ring, Y-Ring, V-Ring, U-Ring, E-Ring,SizeCustomized/standard and nonstandardMaterialNBR, HNBR, EPDM, SILICONE, VITON, FFPM, PTFE, etc. ...