Roller Derby Cobra Boy's Adjustable Inline Push-button adjustment for a custom fit. Molded boot. Reinforced nylon frame. Locking cam-lever buckles. Padding for a comfortable feel. ABEC 5 race-rated bearings. 64 mm x 70 mm Speed Formula urethane wheels. Manufacturer's 90-day warranty against factory defects. Sizes: Small (12-1); Medium (2-5). Model: I-147B. Made in China.