THROW UP A W Only One condition ： NEW Headset caps are created using a secret printing process that was reverse-engineered from alien technology. They are weather (heat, cold, rain, snow, wind) and UV resistant and are designed to fit 1 1/8" headsets and measure 1 1/4" (32mm) in diameter. (This is the most common size on modern bicycles.) These caps are flat across the top and weigh 6 grams.