Flashing roller The 2 wheeled skate fits on back of heel. Light-up wheels no batteries required The instruction: 1. Use the screwdriver to loosen the screws 2. Hold both ends and pull outwards. 3. Place the heel of the shoe on the skate. 4. Hold both ends and push inwards to hold shoes tight. 5. Remove the shoe and tighten screws. It's the new street sensation with a unique, innovative design. Its easy to use, fully adjustable and one size fits all. Special pu wheels with 4 lights Colour gift box 40pairs/ctn G.W:34kgs /n.W:33kgs Minimum order quantity1000set Meas:51x39x44cm Country of origin: china