The Brake Disc Rotor with floating system can reduce the deformation of the bike rotor at high temperatures and reduce the heat transferred to the center, which guarantees an excellent performance of the brake. This floating brake discs is designed with two kinds of material through rivet connection.This connection is a certain amount of freedom,which reduces heat transfer and solve the problem of internal stress. Features: Made of stainless steel and aluminum alloy,super strong and durable. Floating system with rivet connection,good abrasion performance,quick ventilation, and good heat dispersion. Hollow frame for excellent heat dissipation and drainage. Suitable for most bikes with standard six-bolt hubs. Easy to install on your bikes. Specification: Rotor diameter: 160mm / 180mm /203mm (optional) Color: Black / Red (optional) Material: Stainless steel + Aluminum alloy Center Distance: 44 mm Thickness: approx. 1.8 - 1.9 mm Rotor Weight: approx. 103g / 144g / 185.5g Package List: 1* Floating Brake Disc Rotor (bolts are not included)