RK 428 SO O-Ring Chain - 120 Links , Chain Type: 428, Chain Length: 120, Chain Application: All 428SO X 120 High-quality pins, bushings and rollers for maximum durability All pins are 4 point rivetedRKs specialized U grease provides lifetime internal lubrication Several chains feature XW type O-rings which provide better internal lubrication sealing for extended chain life All O-ring chains are backed by RKs unbeatable 20,000 mile warranty Suitable for 250cc max.