The Nekid Cow Brand Skull & Crossbones Tire Valve Stem Cap (caps) Covers for Bike, Bicycle, Car, Cars, Motorcycle - Brass Threads - 4 Pack Stem Caps - Includes Motorcycle Riding & Restoration Guide - GUARANTEED Skull & Crossbones Tire Valve Cap Fits Standard Threads in the USA Brass Threads Tough ABS 4 Pack