The RPT slip-ons make use of all of the high-tech features of our regular three-inch slip-on mufflers, including two-inch constant velocity cores for exceptional sound and performance, as well as the bonded e-glass and stainless steel mesh. The RPT designation comes from adapting the design from our Race-Pro four-inch muffler into this three-inch size. The bodies begin as three-inches at the front until they expand to three and a half inches at the rear. The black tip is also the Race-Pro machined design that's held in place with 12-point bolts.Fits all Harley-Davidson Rocker C models. Comes with 2" constant velocity baffles that use bonded e-class sleeve with stainless mesh (see photo).