Material: Mufflers are made from high grade Carbon Fiber polished to a mirror finish. All parts are hand welded with superior look and sound to the stock exhaust to enhance your motorcycle. Easy to install:This set includes all necessary hardware to mount the onto a stock header.Easy to install. High performance:High performance motorcycle carbon fiber round slip-on exhaust muffler,great for short trips around town where you need to be heard. Advisement:No rejetting or remapping is required after fitment on a stock bike however we always recommend a dyno test. If the motorcycle has other modificaitons to the intake or exhaust system some tuning may be required. Universal fitment for most motorcycles/dirt bikes/scooters with 38-51mm diameter models. Product description Feature: Made from Real Carbon Fiber High performance motorcycle carbon fiber round slip-on exhaust muffler. CNC-machined billet aluminum inlet joint and outlet cap. Has the good permeability and heat resistance.  Packing included:1 x Carbon Fiber