... ,nylon,Specification (Φ)60, 75, 89, 108, 114, 127, 133, 159mmCertificateSupplier Assessment, Main Product Lines Verification, ISO, SGS 1.Extremely high wear ... excellent self-lubrication makes it diffficult to stuck in harsh conditions even without greasing;3.Antistatic,flame retardant resistance,aging resistance ...