Signswise Golden Threadless External Headsets Sealed Cartridge Bearings Stack Height: 17.5mm + 12.5mm = 30mm Size : 28.6mm (1 1/8") x 34mm x 30mm,Weight: 110g/set Model: Threadless External Headset Material: 6061AL-T6 Full Set CNC Machined Free Ship from China via ePacket, usually takes about 10-15 business days for the delivery