1、Aluminum Alloy Material: The bicycle cassette body is made of aluminum alloy material, which is sturdy and durable, not easy to corrode or rust, has high strength, and long service life. 2、Exquisite Workmanship: The mountain bike cassette body adopts excellent manufacturing technology, and the surface is finely polished to ensure strength and improve fastening reliability. 4、Easy Installation: The bike cassette body adopts a small sized design, making it easy for you to install and disassemble, saving you time and effort. 5、Scope of Application: Mountain bike cassette sprocket tower base is suitable for 44mm / 7in outer diameter, 7.1mm / 0.3in height, 36 tooth rings, 72 rings, supports for 11 speed, 8‑10 speed, requires 85mm washer. 3、Portability and Replacement: The road bike cassette body is rust proof, lightweight, small in size, and easy to carry. It is a DIY replacement part for bicycles.