Pulsar SK8 GrinderThis skateboard wheel grinder is ready to shred at home, at the skatepark, on the streets, and anywhere else you can think of. The SK8 Grinder comes in a variety of color options with skate wheel designs and real spinning bearings! The exterior is covered with a grippy silicone sleeve, and it measures 2. 2 inches (5. 58cm) in diameter with one chamber for grinding herb, one chamber for storing herb, and an included pollen scraping tool.