Material: PVC Size selection: 55cm (recommended height 140-160cm) 65cm (recommended height 160-170cm) 75cm (recommended height 170-185cm) Note: Air pump needs to be purchased separately Product features: 2T load-bearing, 2mm thick, safe and explosion-proof Highlight: This item is such a simple exercise tool that is safe and very effective to strengthen and tighten your physique. It can be used for low-back and abdominal exercise. It also can be used for yoga and pilates. Ideal for extending body muscle, improving balance capacity and shaping perfect figure, this item provides an enjoyable exercise alternative for both young and old and also perfect for use during pregnancy! Product Features: Help to isolate specific muscle group while training Improve balance and coordination Gripping ridges provide extra traction Great for relief tension and stress Strengthens, tones and stretches the entire body Perfect for all ages and fitness levels Package Include: 1 x Yoga Ball or 1 x Pump Air