Billet 2" Velocity Stack Keihin TM PE 28 PWK 28 Carburetor Intake 50mm (Blue color) ,30pwk fit for koso OKO and so on , silvery color his listing is for ONE 2 inches long silver anodized billet aluminium velocity stack for (Air Intake 50mm) such as Keihin PE28, PWK28 28OKO 28fit for koso and Mikuni TM28. Three fastening bolts are included with each velocity stack.