Hammer Boxing Bag Sparring: The boxing bag with a twist - Here, reaction and flexibility are essential. The energy from the punches sets the boxing bag into a rotational motion, continuously changing the position of the target zones. The suspension with a swivel and chain allows for a varied boxing workout and requires constant adjustment of punch sequences and angles. Additional details about the boxing bag: Delivered pre-filled. Outer material: Nylon. Application area: Training. Weight: 18 kg. Color: Black with white target zones. Included in the delivery: Suspension chain and swivel.