Sure grip rock gt 50 quad derby skates blackthe rock gt50 is a high quality entry level skatethe gt 50 features a comfort fit deluxe synthetic leather upper with a cinch strap and cushioned contour insoles a rock plate sgi black and white rock swirl wheels and sgi abec 5 bearingsspecifications rock gt 50 manmade boots by sure grip rock stealth nylon double action speed plates rock gt 50 swirl 62mm speed wheels sure grip abec 5 speed bearings adjustable toe stopswant to know more check o