1、Using metal bearings, 360° rotation, high speed, and accurate insertion of the front fork, unhindered and free. 2、Made of aluminum alloy, T6 heat treatment, CNC process, light weight and constant strength; Internal full deep ditch ball bearings, efficient operation, lasting silent. 3、Integral sealed bearing keeps the lubricant in the bearing, which has good dustproof effect and is suitable for harsh riding environment. 4、Rubber waterproof loop, adding a layer of waterproof loop in the bowl cover, anticorrosion, waterproof and sandproof, longer service life. 5、Suitable for the inner diameter of the upper tube of frame head tube is 44mm, the inner diameter of the lower tube is 50.6mm, and for the small tapered tube fork, the outer diameter of the upper end is 28.6mm and the outer diameter of the lower end is 33mm. Item Type: Bicycle Headset Material: Aluminum Alloy Specification: 44-50.6mm (Use with 1.25 Small Cone Tube Front Fork) Applicable Situation: Frame Head Tube: Upper Tube Inner Diameter 44mm, Lower Tube Inner Diameter 50.6mm. Front Fork: Upper End Outer Diameter 28.6mm, Lower End Outer Diameter 33mm. Applicable Measurement Instructions: (The same four data can be applied) The inner diameter of the upper tube and the inner diameter of the lower tube, to obtain the inner diameter of the upper and lower tubes of frame; The outer diameter of the upper end and the outer diameter of the lower end are the outer diameters of the upper and lower ends of the front fork. 1 x Sunflower Top Cover Kit 1 x Headset Cover 1 x Urging Loop 1 x Upper Bearing 1 x Upper Headset 1 x Lower Headset 1 x Lower Bearing 1 x Bottom File