service kits: - ISO9001: 2008 standard OEM/ODM are welcomed service kits:Product all kinds of service kit.Good quality and best prices1Material: NBR and Viton or as customer request.ROHS approved.Hardness: 60-90 shore.Color for o rings: Black, Purple and so on.Color for box: Red, Black, Blue, Green, Yellow, White and so on. Standard size as follows: [1]30 sizes, total 382pcs, AS 568 standard, ...