Utilize solid rollers for unmatched performance and durability, All chains measure 120 links, The SX3 is a high-quality performance street chain intended for high rates of speed and stress, Unique Duo-Glide™ seal design provides two pockets of lubrication per side allowing the SX3 chain to operate under the harshest of conditions for extensive periods of time, Duo-Glide™ seal design reduces heat and friction resulting in wear life that is seven times longer than standard O-ring chains