Twin Slash Rounds take the classic look of a round slip-on and add a touch of distinction with a twin slash end treatment, at an unbeatable price. Best Value Touring Slip-On. Large 4-inch Round Muffler Body. Signature Twin Slash End Treatment. Optional Quiet Insert Available. Fits: 2017 TO 2020 FLHT/FLHTK/FLHR/FLHX/FLTRX/FLTRU/FLTRK Dresser Models.