Product Specifications:Product shoe size: Please refer to the size chart to buy (you can inquire if you don't understand)Color: silver, White Red, White and blue, Light black, Blue black, Red black, White black powder, Black silver powder, Cool white, Cool black, black, whiteSole Material: RubberCategory: RollerUpper material: Microfiber leatherWheel type: double rowWheel body material: PUCategory: Skatesfeature:Type: Automatic button. The safety foundation of invisible buttons.There is a button on the back of the shoe, press and hold, open the wheel, press and hold the button, then push the roller to the sole and releasenote:* When opening and retracting the wheel, make sure that the direction of the arrow is vertical, and then tap the switch with a certain force (momentary impact force).* The direction of the arrow is not locked vertically. This is the state of the security lock. Can't switch steering wheel when lockedSolutions to common problems:* The switch is stuck and cannot rotate: You can insert a sharp tool into the edge of the round hole of the switch to pull out the switch* Can't open the switch: check if the wheel is clamped too tightly. If the wheels are too tight, replace the left and right wheels* The wheels are not installed in place: clean the impurities in the bracket, add some lubricant to the friction parts, and switch between the brackets