Features 1、Adopt high grade metal material, high strength, durable, anti-rust and wear resistant for long term use. 2、Available for common full hidden, semi-hidden and external headset bearing. 3、Five types for you to choose, meet your different needs. 4、Use sealing rubber ring, can effectively prevent water and dust from entering. 5、Wonderful accessory for mountain bike, road bicycle. Features: 1.Adopt high grade metal material, high strength, durable, anti-rust and wear resistant for long term use. 2.Available for common full hidden, semi-hidden and external headset bearing. 3.Five types for you to choose, meet your different needs. 4.Use sealing rubber ring, can effectively prevent water and dust from entering. 5.Wonderful accessory for mountain bike, road bicycle. Specifications: Material: metal Color: As picture shown 41 x 30.2 x 6.5mm/1.6 x 1.2 x 0.3in; 41.8 x 30 x 6.5mm/1.6 x 1.2 x 0.3in; 47 x 34 x 7mm/1.9 x 1.3 x 0.3in; 49 x 37 x 7 mm/1.9 x 1.5 x 0.3in; 52 x 40x7 mm/2 x 1.6 x 0.3in. Packing List: 1 x Bearing Note: The inner ring color of the bearing is random. Package List