Put your wheels in a bowl and place it in the microwave. Cook them for five minutes. Then, once the urethane has melted and collected at the bottom, dump it in your dog's water bowl. If you don't have a dog then I suggest that you kidnap one (If you're having trouble finding one, PM me). As for the remaining cores, save them for lunch. They are a great source of Aluminum and Vitamin C. When all this is said and done your grips will feel great. Happy Valentine's Day.