Adjustable inline skates can be adjusted to different sizes by pushing a button as kid's feet growing to ensure years of fun. 3 sizes (S/M/L) are available for your choice, please check size chart in the product image and choose the proper size.# Reinforced aluminium alloy frame, ABEC-7 bearings, durable PVC wheels, high rebounded 82A polyurethane heels and rubber (TPR) stopper. High quality skates provide you a smooth, quiet and confident ride!.# illuminating wheels will be lighted up automatically when you start to skate which offers more fun for kids to hangout. There are colorful LED lights inside the wheels with self-generating power. No battery needed.