The new Undercover Antirocker wheel is extremely stylish and strong in addition to having a dual color pour. has a 49mm diameter, a 65D (rockhard) hardness rating, and a flat profile. This antirocker wheel doesn't require a core because of its exceptional hardness, assuring optimum durability. Even with a 60mm wheel arrangement, its size eliminates the possibility of wheel biting. For any ambitious street skater, a must-have!