"In Heat"Size: 75mmDurometer (urethane hardness): 80a and 83aContact patch (width of wheel in contact with ground): 56mmRiding style: hard carving, pumping, downhill racing, dancing, sliding (once broken in)These wheels are designed for grippy, hard carving and pumping. They will slide when broken in.The In Heat features a slalom influenced offset design, with hard sharp edges for grip, thick lips for maintaining speed, and rippled inner walls for progressive energy return.Poured with the specially formulated, high rebound "Happy" urethane. Shaaaa BAM.