Primary Clutch / Oversize Rollers Roller Size:Standard Rollers When you hit higher RPM

When you hit higher RPM this muffler has an exceptionally good tone without being obnoxious

Much better power transfer than the stock weights

Leak-Proof Seal: Supplied with heavy-duty stainless steel T-Clamps to guarantee a rock-solid

Kit Includes: BMP magnetic adjustable weights

This ensures immediate throttle response

Primary Clutch / Oversize Rollers Roller Size:Standard Rollers When you hit higher RPMTune your TRA to perfection with these stock or oversize rollers for your primary. Stong construction will not wear out quickly and roll extremely smooth. Choose from stock (10 gram), 1mm oversize (12. 5 gram), or 2mm oversize (15. 5 gram). Sold as a set of three.