TKR33345X - Vented Brake Disk Vented Brake Discs deliver improved braking consistency, reduced rotating mass, and factory-quality performance. Manufactured from hardened steel and precision ground for a perfectly flat braking surface, these discs provide a smooth, consistent feel right out of the package. Featuring 24 cross-drilled vent holes, the discs help improve cooling while reducing weight. Rotating mass is reduced by 3.5g per pair, quickening drive train response, and possibly resulting in a slight fuel mileage improvement during longer mains. Note: 1 Package contains 1 disk. 2 packages are required to equip one complete vehicle.