【2-in-1 DESIGN】: Four-wheel skates can freely switch between single and double rows to suit more advanced skaters.Each roller blades is built with 4 glowing wheels,the wheels will light up automatically when you start skating.It is designed with a self-powered system,no battery needed.Just skating and being the shiniest star.Your kids will be safer and have more fun with these flashing wheels.These skates have better balance and are ideal for beginners.【SIZE ADJUSTABLE 】: The inline skates are easily adjustable with a simple push of a button. Each rollerskate has 4 size adjustment ranges and is recommended for children and adults aged 3 and above. 3 sizes available, S for foot length 7.28-8.39inch(for toddlers), M for foot length 8.46-9.65inch(for kids), L for foot length 9.65-10.83inch(for teenagers,adults). Please refer to our size chart and choose the proper size,Thank you.【SAFE AND RELIABLE 】: Built with reinforced aluminium frame ,It makes our rollerblades durable for years use.With the wear-resistant brake on right skate,It allows you to enjoy a safe, fast and smooth ride. The rear brakes in both configurations can decelerate or stop easily and safely. The rubber wheels are designed to ensure high-speed performance, but they can skate safely every time. Adjustable straps and adhesive stickers can be easily fixed.