NEUSPEED 370mm 2-Piece Full-Floating Brake Rotors - Only the highest quality materials and incorporating the latest racing brake rotor technology went into building these rotors. The 2-Piece Full-Floating Rotor offers the advantage of weight savings and quicker heat dissipation. Plus the reduction of unsprung weight improves handling characteristics under all situations and this reduction in rotational inertia allows for faster acceleration, decreased braking distances and more responsive handling.Benefits of Full-Floating Rotor – a race-bred technology. This design allows the disc to "float" in both radial and axial directions, enabling the disc to expand and contract according to temperature variations for better braking performance. By allowing the outer disc to expand away from the hub under extreme heat reduces the tendency of the rotor warping.Fits Only NEUSPEED BBK 370Direct Bolt-on for use with NEUSPEED 6-Piston Big Brake KitThese are NOT factory replacement rotors for vehicles originally equipped with 370mm rotors.Optional Upgrade Kit includes NEUSPEED 370mm 2-Piece Front Rotor Kit & supporting NEUSPEED 6-Piston Big Brake Kit Caliper brackets.Notes:Features:Aluminum Hat - 7075-T6 for better strength and lower deflection rate. Coating Type III Black Hard AnodizedRotor - 370mm x 34mm, Grey Iron, Heat Treated, Slotted, 72 Curved Veins, Directional VentsStainless Steel Full Floating Hardware - "H-Bobbin" hardware type, significantly reduces heat transfer to hat, more expensive option but it is used on many race cars versus "D-Bobbin" type.Weight - 21.85 lbs. each (TTRS 370x32 Factory Rotor: 25.5 lbs.)