Venom Skateboards Perforated Black Grip Tape for Skateboards. Made from Silicon Carbide with a self-adhesive backing. Approximate coarse rating: 90 grit. These sheets are perforated with 100s of tiny holes, normally only found on premium brands, that allow air bubbles to escape from under the griptape when applying to skateboard decks. This means you get 100% surface adhesion to the deck and no lift, ensuring the best performance for flip tricks. At 90 grit, it’s tried and tested to be the perfect balance between grip and flip-ability while not being too aggressive on your shoes. We'll send this out to you layed flat rather than rolled to keep the cost down and ultimately make this the best quality grip tape at the lowest price. This does not affect the grip tape performance in any way, it will still apply as expected.