WHEEL PROFILE Medium - Your classic wheel shape, versatile all-around wheel for street/park skating. SURFACE Smooth - Smooth wheels come with a shiny coating on the riding surface that feels grippy at first, but wears away quickly. KEY FEATURES Formula Four Urethane - Unmatched abrasion resistance for fewer flat spots. More controllable grip. Lasting speed no matter the terrain. Smooth anti-slick slide and a longer lasting size and shape. WHEEL SHAPE Classic Full Shape - The Classic profile with an increased riding surface designed for speed and stability. DUROMETER 99a - Offers more grip than harder wheels and more slide than softer wheels. Great for slick surfaces when you want more control. SPECS SIZE 52MM 54MM DIAMETER (MM): 52.0 54.0 WIDTH (MM): 32.5 34.0 RIDING SURFACE (MM): 21.0 22.0