Thank you for viewing. The Smart Wonder Core, with foam padding, supports comfortable training. - Model Name: Smart Wonder Core - Color: Black and Yellow - Brand Name: Wonder Core - Material: With foam padding Designed for long-lasting use! The springs of the Wonder Core Smart are designed to withstand 160,000+ abdominal exercises. Even if you do 100 sit-ups a day, that's over 4 years! Furthermore, it's safe even for those who use it hard! I purchased it a while ago, but it has been stored without being used. There is no box or instruction manual. Please purchase only if you understand this. This is a used item. Please understand and purchase. If you have any questions, please ask.