AND RUST RESISTANT: Our folding bike seatpost mushroom block is and rust resistant for longer service life. EASY TO INSTALL: This folding bike seatpost mushroom stop overall light weight, very easy to install, and very friendly to newcomers. ELECTROPLATING AND POLISHING: This folding bike seatpost mushroom stop adopts electroplating and polishing, the achieves mirror finish, which is decorative to use and makes your bike more cool. ENGINEERING 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. CNC ACCURACY MACHINING: Our folding bike seatpost mushroom stop is made of CNC accuracy machining with high strength.