Signswise Bicycle Carbon Fiber Stem Top Cap Threadless Headset 1 1/8 MTB Bike" Material: Carbon fiber Feature: Super lightweight,durable,rustproof,waterproof Unique black Specification: Dimension: 3.1cm(Outer Dia.) x 1 cm(Inner Dia.) x 0.5 cm(Bottom Dia.) x 1.2cm(T) Color Notice: Please check the size before you buy Package includes: 1 x carbon fiber headset top cap