Feature:1. Can be used as a weight‑lifting ball. The maximum weight after filling with water is 10.5kg / 23.1lb(approx.).2. Water quantity can be reduced according to the individual's ability. Convenient storage without taking too much space.3. Circumference about 104cm / 40.9in and the diameter about 31cm / 12.2in, safe and reliable for fitness use.4. Also can put on the ground as a small yoga ball (Water can be injected or not injected), meeting your different demands.5. Made of high quality PVC material, not easy to break or leakage, durable and have long service time.Spec:Item Type: Water Filled Kettle BellMaterial: PVC Circumference: Approx. 104cmDiameter: Approx. 31cm / 12.2inMaximum Weight: 10.5kg / 23.1lb(approx.) (After water injection) Weight without Water Injection: 0.6kg / 1.3lb(approx.)Instructions:1. The nozzle core rotates outward counterclockwise and then inflates, otherwise the air will leakage when it stops pumping.2. It is recommended to inflate to half to form such a funnel and then add water. When adding water, press the gas nozzle core down.3. The inflating head is close to the air nozzle and the air nozzle is covered when full.4. Press the nozzle core down when the air needs to be vented.Package List:1 x Water Filled Kettle Bell1 x Air Pump1 x Air Pipe 1 x Storage Bag Note:Please allow 1‑2cm error due to manual measurement. Thanks for your understanding.