This is an abdominal muscle training aid. 【Size】Width: 53.5cm, Height: 34cm, Depth: 51cm (approximate) 【Selling Points】It's hardly been used, so it's like new and still in great condition! The Smart Wonder Core supports comfortable training with its foam padding. - Model Name: Smart Wonder Core - Color: Black and Yellow - Brand Name: Wonder Core - Material: With foam padding I purchased this quite a while ago, but it's been stored away with little use. There is no box or instruction manual. Please purchase only if you understand this. If you have any questions, please ask.