Made of high quality material, durable for long term use.Thick high density multi-layer: Oxford fabric, rebound glue and lining. Come with chain and zipped top for easy hanging and filling, maximum load capacity up to 20kg.The sandbag is empty, you can fill in items, wood chips, rice husks, wheat, corn, wheat bran, cotton, old clothes,river sand ,rag, saw dust, sand, cotton, etc.Used for punching, kicking, martial arts and general fitness, enhance your endurance, speed and accuracy.With hook hanging use stability, often exercise strong and strong, increase immunity, self-defense training, the effect is 100 times.Used for muay thai,karate,wushu,sanda training.It can improving the hitting power,reaction speed and accuracy. It's energy-absorbing efficiently, great grip feeling ,meeting the standard of equipment for muay thai,karate,wushu,sanda training.