Abdominal exercise machine / flat support machine in one-- Scientific force, automatic rebound, easy to use. Five layers of anti-slip materials, anti-noise and wear-resistant: anti-slip layer, reinforcement layer, shock absorption layer, noise reduction layer, support layer. AUTOMATIC REBOUND DESIGN--- Our ab roller with automatic rebound technology, automatic steel rebound intelligent auxiliary brake, built-in brake system, steel rebound more smoothly. DOUBLE WHEEL DESIGN--- This exercise abs roller has a wider front and back two wheels for smooth rolling and better control. It helps you work out every muscle and in your core and at the same time provides safer control of your body, especially for beginners. EXCELLENT WORKMANSHIP--- This rebounding roller is made of stable, eco-friendly plastic with sponge grips that are non-slip, sweat-absorbent, comfortable, fade-resistant, durable, won't make noise or scratch the floor, and provide longer GROW 6-PACKS FASTER AND SAFER-- The amazing abs roller kit helps men and women burn fat faster and sculpt your 6-pack! This roller is specifically designed to tone your body!