1. Material: metal 2. 180-degree multi-directional key belly, turning more freely 3. Prone crunch exercise while building arm and abdominal core strength 4. Triangular stable structure, curved groove handle, comfortable grip, non-slip perspiration 5. PU material universal roller, quiet and environmentally friendly 6. Small size, no need to fold for storage 7. Size: 32.5x6.8cm 8. Weight: 2kg