Lightweight CNC aluminum alloy valves. These are top nut style to protect the valve from being damaged or unthreaded during mounting of stiff race tires. Less than half the weight of steel valves. Will not rust. BRONZE anodized, matches the lip of the bronze 6UL. Laser etched 949 logo reputed to be worth 3hp, no really. 2 per 6UL wheel needed (8 for 4 wheels).