Vance & Hines High Performance Valves For Harley Twin Cam Features: Precision CNC machined from a stainless one-piece forging for greater strength and durability High grade alloy allowing the valve to withstand high heat and still maintain roundness Chromed coating on all stainless valves Micro polished stem for smoother finish and less friction resulting in improved performance Multi angle back cuts for enhanced flow Track tested and proved design on the world's fastest Pro Street & Pro Mod motorcycles Exhaust set 1.575, 7mm stem 2 per set