Features： 1、Adopting aluminum alloy, this product is durable to use. 2、Built-in stainless steel perrin bearing, better experience. 3、Rotating flexibly with great lubricating effect. 4、Can be applied for most bicycles' modification. 5、With its surface electroplating polishig. Specification： Features: Adopting aluminum alloy, this product is durable to use. Built-in stainless steel perrin bearing, better experience. Rotating f lexibly with great lubricating effect. Can be applied for most bicycles' modification. With its surface electroplating polishig. Specifications: Item: Internal Bearing Material: Aluminum Alloy Colour: Black, Red, Golden, Silver (Optional) Weight: Approx. 75 g Size: Approx. 3 x 5cm / 1.2 x 2.0inch Fitment: for 28.6 mm Front Fork Suitable for refitting major models: for SP8 / SP18 / VP18 / MUP8 / JP8 / BYA412, etc. As long as it is a built-in 44MM modified folding car, most of them can be used Package Included: 1 x Internal bearing Package List：