Adjustable with three different weights: 18g, 23g, and 28g. By shaking your head, you create resistance to train your facial muscles and lift your face. I used it a few times and then stored it, so it's in good condition. The box is also clean, with no noticeable scratches or damage. The mouthpiece has been sterilized, but you can purchase a replacement separately. Please understand that this is a used item before purchasing.