Check the listing for details. #40 Roller Chain High Quality SRB 10ft Senqcia Inspire series. Condition: New. Listed at 59.33 USD. Senqcia1Outstanding longer wear lifeConventional split bushings deform into a barrel shape when side plates are pressed on, leaving only two-point contact area. SBR (Solid Bushing and Roller) chain has extremely cylindrical inside and outside bushing walls resulting in full contact to disperse bearing pressure. Less pressure ensures excellent wear resistance. 2Up to 2-3 times longer wear life over curled bushingsThe curled, split bushings have a seam where tiny space allows lubricant leakage resulting in shorter wear life. SBR has no seam resulting in lower bearing pressure allowing the bushings to retain lubrication resulting in much longer wear life. 3Reliable performanceSBR is cold-forged from steel rod. Cold-forming process also works with the molecular structure (grain) of the steel running lengthwise in the bushings thereby increasing fatigue strength as well as preventing bushings from breakage, SBR chain improves performance of transmission with minimizing elongation for long period of time.