Eight urethane Doughnuts rings, great abstraction ring that goes with all stock drop Thru decks. Array Doughnuts use and instillation, These urethane parts in between your base plate and Drop deck. Add the bolt then base plate, add doughnut underneath top part of the baseplate, add through hole. To the deck add washer lock nut tighten down. The Doughnut can also be used under the counter sink washer as added absorption pad on top base plate on trucks or under the deck if the hardware is being flipped. Good for two drop decks, as low angle wedge. Good shock absorption stop the clanking,rattling. Helps keep the vibration from the deck and on your feet. Has more than one use play around with them. Heavy duty urethane rings.