These are cute, unicorn-themed rollerblades for children. They were used by a child from late kindergarten to early elementary school. They have an adjust system, allowing you to change the size by lifting the knob and sliding. The hex key for wheel replacement and spare shafts that came with the purchase are also included. As a bonus, I'm also including light-up wheels (set of 2). I bought these because my child wanted them, but they were never used, so they are new.