The add on star trac box master kick pad from gym company this optional extra for the box master attaches to the bottom free area of the tower tower required for best results providing the user with a kicking area that is more used for martial arts the central punching area of the box master area 12 is not suitable for receiving knees or kicks so the addition of this optional extra provides even more dynamicity to the already versatile box master key features of the star trac box master