1CNC ACCURACY MACHINING: Our folding bike seatpost mushroom stop is made of CNC accuracy machining with high strength. 2ELECTROPLATING AND POLISHING: This folding bike seatpost mushroom stop adopts electroplating and polishing, the surface achieves mirror finish, which is decorative to use and makes your bike more cool. 3ENGINEERING PLASTIC AND ALUMINUM ALLOY: Folding bike seatpost mushroom block is made of engineering plastic head with aluminum alloy and steel, both the flexibility of plastic and the durability of steel. 4CORROSION AND RUST RESISTANT: Our folding bike seatpost mushroom block is corrosion and rust resistant for longer service life. 5EASY TO INSTALL: This folding bike seatpost mushroom stop overall light weight, very easy to install, and very friendly to newcomers.