Product specifications:Product shoe size:31,32,33,34,35,36,37,38,39,40,41,42,43Sole Material: RubberCategory: RollerUpper material: super fiber leatherWheel type: double rowWheel material: PUCategory: skatesfeature: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 releaseNote:*When opening and stowing the wheel, please make sure that the direction of the arrow is upright, and then tap the switch with a certain force (instantaneous impact force)*The direction of the arrow is not the vertical lock. It is the state of the safety lock. The locked state cannot switch the wheelCommon problem solving methods:*The switch is stuck and cannot be rotated: the sharp tool can be inserted into the edge of the circular hole of the switch to pull out the switch*The switch can't be opened: Check if the wheel is clamped too tightly. If the wheel is too tight, replace the left and right wheels* Wheels are not in place: clean the impurities in the bracket, add some lubricant to the friction parts and switches between the brackets