Flashing Wheels,Roller Skating Gliders with led Wheels, Heel Roller Adjustable,Roller Skating Shoes for Adults & Kids(Assorted) Adjustable base, Minimum width (heel end) of Footwear Suitable for:Adult and children (over 6 years old) Wear it with sport shoes/school shoes/sneakers but not sandals for safety measure It has 4 flash light inside, wheels will flash with the movement without batteries. It is easy to identify in the night