I've used it about twice since I bought it. There are no scratches. I don't know the size, but my child used it when they were in the first grade of elementary school. A pink children's knee and elbow protector set, with a storage bag. - Color: Pink - Type: Knee and elbow pads set - Brand: Bridgestone - Includes: Knee pads, elbow pads, storage bag - Target Age: Children - Design: Cartoon characters Thank you for looking.