High Quality Material Makes an Durable Punch: This punching bag is made from super microfiber leather, which has greater durabilty and softer texture than PU leather, it's designed for the ultimate full-length heavy bag training experience. Punching bag Unfilled: The zipper enclosure top allows you to conveniently fill up the bag. Recommend to use grains and dry sands to weigh down and rags, sawdust, foams to buffer and absorb impact. Cross Nylon Strap on Bottom: The bottom of the sandbag is sewn with several threads. It will support more weights- which is up to 66 lbs. Upgraded Metal Swivel Chain Set: The mount chain comes with 4 snap locks, use as swivel hanger or extension chain. They are resistant to rust, offer exceptional holding strength, ideal fixture stability. Wide Use: With the size 32"x11", it's suitable for seniors and adults. The punch bag is used for boxing, MMA, Muay Thai,Martial Arts. Perfect for developing hand and foot technique and building good body. 32"x11" Unfilled Punching Bag 4 Layers: Microfiber leather Soft lycra liner Resilient gel sheet Canavas liner