Black Bite is the prep that will stick when you need to stick. This prep will put a huge amount of bite in the tires when nothing else will get you hooked up. This prep is great for adding bite and making the tire dig into the track without locking the kart down. Use this prep right before going to the grid. Depending on the brand of tire this prep can drop the duro up to 8 points in a 30 minute period. If heat is put to the tire with this prep it can drop the duro even further.