Features: Made of high quality PVC material, lightweight and durable, no easy to deform. Bottom chamber is for water or sand to increase weight to keep it stand stable on the ground, more stable and reliable. Upper chamber is for inflating air to avoid scratching the skin of your limbs, soft and elastic. Resilient backbone for better stability, bounce back up immediately without falling over. Great accessory for improving coordination and flexibility, burning calories and relieve pressure, suitable for kids, teens and adults. Specifications: Material: PVC Color: Yellow/Black/Red (optional) Height: 155cm / 5.1ft Top Diameter: 30cm / 11.8in Bottom Diameter: 60cm / 23.6in Package Size: 25 * 18 * 3cm / 9.8 * 7.1 * 1.2in Package Weight: 700g / 24.7oz Package List: 1 * Punching Bag