Riedell Skates - Dart - Quad Roller Speed Skates The Boxer Quad roller skates are popular with so many kinds of skaters! Roller derby rookies, speed skater, jam skaters and recreational rink skaters alike all love the Boxer skates! Quad roller skates are available in black with black wheels. The Boxer quad speed skates feature comfort padding and the Velcro power strap to make sure you have the best fit as you zoom around the rink. Boxer 62mm speed wheels and ABEC 7 bearings ensure it will be a smooth fast ride. Skate fast and comfortable in these Sure-Grip speed skates.