Good thinking, using an ingenious mechanism he polished the CD from the center to the outer edge, the handle contains the accessories (spay and cloth). It was a bit hard to believe but it works, my first tests were performed on DVD-RWs that had become unusable through being cruised. After a few laps I was able to skip doctor re-burn and reuse. If we wanted to rebuke this device would be the consumables prices (in fact, the polishing wheel wears and replacement price is close to the price of the full kit) and its bulk. Otherwise it is a good investment especially for those who have a console, considering the price of a game ;-)