... Neoprene(CR),Styrene(SBR) ,CR,ACM,PU etc. Application: O ring is widely used in different industries: Auto, Machinery, Electronic, Water ... products conform to AS568,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, ...