Description: 100% brand new and high quality. With two smooth sealed cartridge bearings. Headset top cap to sit atop your threadless stem and add a bit of style to your bike. Sealed cartridge bearings. Compatible with threadless 1 1/8" (28.6mm) and 1 1/4" (30mm)steerer tubes. Specification: Material: Iron and Aluminium Stack Height: 38mm Size: 1-1/8",1-1/4" Head Stem-Build: external Cartridge Bearing Diameter:44/28.6+47/30(mm) Package Includes: 1 Piece Bike Threadless External Headset