... Neoprene(CR),Styrene(SBR) ,CR,ACM,PU etc.Application: O ring is widely used in different industries: Auto, Machinery, Electronic ... Metric, GB 245201.O ring detail for reference:1. Size : O ring circle diameter (C.D) Minimum0.44mm. O ring outer diameter Maximal ... 530mm2. Color: black, white, yellow, brown, green, blue, transparent, red, natural etc.3. Hardness ...