Features: Stem Headset Top Cap Cover, Universal Headset Cap for MTB Road Bike Headset top cap to add a bit of style to your bike to sit on your threadless stem. These are absolutely simple and elegant design, just right in solid color. Made of lightweight and durable aluminum alloy. Bicycle Accessories Specifications: Color: Black, Red, Blue, Silver (Optional) Material: Aluminum Alloy Size: 1 "/1-1/8" Diameter: M6 External Dimensions: Approx. 32 x 32 x 8mm / 1.3 x 1.3 x 0.3" (Diameter x Diameter x Thickness) Weight: Approx. 0.3 oz (9 g).