Application strengthening training stabilization training endurance training fitness training Strengths engages many muscle groups, especially the abdominal muscles solid construction ergonomic, non-slip handle small size and weight you can use it in many places does not scratch the surface wheel diameter: 180 mm handle diameter: 29 mm handle length: 110 mm width: 300 mm product weight: 0.5 kg material: PP + TPR (wheel), PVC + TPR + steel (handle) Warranty period: 6 months