... .60mm 4.color:natural.black.blue.yellow 08B B Series Roller Chain 1.material:40MN/A32.pitch: ... .long-life duration and high strength7.pre-stretched and anti-fatigue8.sound quality,reasonable price and prompt delivery are ... : 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5,SC6,SC8,SC105 ... A0,A1,A3,A4,A5,A66. O-ring chains and xw-chains: 420,428,520,525,530,630 ( ...