Whether developing punching or kicking skills, nothing will improve your power and skill quicker than "working the heavy bag". The "heavy bag" will help develop power by offering significant resistance. It acclimates students to contact and provides a "body like" target to work with and around. These bags are the perfect size and density for both kicks and punches. Their quality construction and uniform filling will stand up to years of use. All bags come with D rings and a strong spring S-hook.