The Adjustable Sliding Children Roller Skates can be adjusted through the cross wrench(not included). There are three holes for you to change according to the practical situation. The buckle design can tightly fix foot on the roller to ensure the using safety. The bottom consists of a metal panel, which is durable and safe to use. The adjustable sliding roller skates adopts high quality PVC material and high strength carbon steel, which is wear resistant and smooth to work. The rollers are designed for children, which can bring you happy skating time. It also can be used as a gift for your kids.