The grooves help deglaze the pad and prevent fade which occurs when the pad and disc gets too hot! The holes help to keep the discs cool and dissipate heat!
The grooves also help to channel water away from the disc surface! They add the finishing touch behind alloys! This item is in the category "Vehicle Parts & Accessories\Car Parts & Accessories\Brakes & Brake Parts\Brake Disc Rotors".
The seller is "mtec100" and is located in this country: GB. This item can be shipped worldwide.