Product specifications:Product size: 33,34,35,36,37,38,39,40,41,42Sole Material: RubberUpper material: super fiber leatherWheel type: double rowWheel material: PUCategory: skatesfeature:1. Adjustable wheel: retractable rear wheel for skates and classic sneakers.2. Type: Auto button. The security foundation of the invisible button.There is a button at the back of the shoe, hold it down, open the wheel, hold the button, then push the roller to the sole and releaseCorrect opening and closing of the wheels:1. Open the wheels: There are invisible buttons on the back of the shoes. Adjust the arrow up position of the buttons. Press the buttons hard to open the wheels.2. The wheels are closed. There is an invisible button at the back of the shoe. Adjust the arrow up position of the button, press the button firmly, and the wheel closes.Safety: For safety reasons, children must be accompanied by an adult when using roller skates.If you have any questions, please contact our customer service. We will answer your questions within 24 hours.