The PANTHER SERIES Heavy Punching Bag is made of genuine leather and features double-stitched seams for added strength. This top-of-the-line professional boxing bag is designed and engineered to withstand the punishment of top athletes. It has 6 heavy gauge D-ring hangers that are attached by double-layered leather and nylon webbed strapping, which is cross-stitched into the main material for added strength and durability. Once filled, the heavy-duty zip keeps the top securely closed and a flange of material further protects the zip to keep it hidden and unexposed. The bag also has a metal D-ring sewn to the base for attaching a fixing or weight to reduce swinging during heavy workouts.