This item is a pack of mechanical rear disc brake with some screws which are made of good materials. This rotor has a nice shape and color. It is durable for long-lasting use, you can buy it with a reasonable price. The electroplating process is anti-oxidation and colorful, giving you a different cycling experience. Features -Color: Black-Material: Metal, plastic-Size: About16.00X16.00X0.10cm/6.29X6.29X0.04inch- Manufactured with high-end material, it has excellent and high durability and practicality for usage. - The hollow design helps the sediment and rainwater to be discharged quickly.-The obliquely long and large hollow design increases the friction coefficient of the disc.-Even if the disc brake is pulled by the line, it can also cooperate with a good braking effect.-This product has multi-spoke support angle design reduces deflection and deformation. Packing list: 16 x screws2 x discs2 x Hand brake brackets2 x hand brake handles2 x ropes