This high quality accessory is the 8 mm exhaust pipe studs for Performance Exhausts from NCY These replacement exhaust studs are suitable for most 125cc and larger scootersDescription This high quality accessory is the 8 mm exhaust pipe studs for Performance Exhausts from NCY. These replacement exhaust studs are suitable for most 125cc and larger scooters. There have the standard 8mm thread diameter, and are sold as a pair of two.Let Monster Scooter Parts be your source for NCY scooter parts and accessories.0500-1036 ? WARNING California Residents: Proposition 65 Warning