Thank you for viewing. I used this for about two months, practicing once a week for about two hours each time. There are no noticeable chips, tears, or cuts in the sheet, but the sponge is in a messy condition because I failed to peel off the film. I am selling this as a junk item. Would this be suitable for middle school or high school students to try out? Blade size: 157 x 150mm. I used this on a 157 x 150mm racket.