● Assembly required. Easy to assemble. ● Simply hang it on a door to practice alternating arm movements. ● Designed to restore natural shoulder and arm movement. Not intended for muscle building. ● Applying excessive force may damage the door before the unit itself! Please be careful. ● Materials: Main body/steel, Handle/plastic ● Size: Arm length 39cm, Cord 230cm, Door thickness up to 41mm ● Weight: 840g The cardboard packaging is damaged.