[Material]Aluminum & Stainless Steel??the body made of aluminum with stainless steel connector,removable DB killer, offers difference sound effect. [Specification]Overall Length: 365mm,Connection: 51mm Slip-on type [Applicable models]Universal fits for street/sport motorcycles and Scooters with 38-51mm diameter exhaust pipes. [Good Sound]Sounds deep sound??little throaty and not terrible loud. [Satisfaction Guarantee]100% refund if not satisfied. We always stand behind our high quality Products & Services, please do not hesitate to contact us if you have any unsatisfied experience on our product, we will provide friendly, easy-to-reach support for you.