Wheel Core NoneWheel Diameter 55mmWheel Width 35mmWheel Hardness 93aWheel Color GreenWheel Surface Speed: Dragons are very fast because DF-93A is super high rebound, an industry leading 18-20% higher than hard wheels. This higher rebound means you won’t lose speed in bowls or parks the way you would with an ordinary 93A wheel, and you will roll much smoother and faster on rough streets and sidewalks…even in places you used to have to walk your board. Grip & Slide: Dragons slide on both rough and smooth terrains, and also grip when you need it. This is because Dragon Formula is not just an ordinary mid-90’s wheel formula. It has been developed over a ten year period to optimize and fine tune it to perfection. No other wheel can do what these Dragons can.Durability: Dragon Formula is not only smooth, fast and slidable, it is also durable. The slidability comes from its unique blend of high performance materials by making the urethane weak so it will slide as the urethane wears away, not creating flats spots. Dragons are very long lasting so they are not only better skating, they are a great value too. Powell Peralta Dragon Formula 93A Skateboard Wheels Green 55x35mm