Supports dropshipping 20 pieces per box, each individually packaged [Instructions for use] 1. This equipment is for single-person use only and must not be used by two people pulling it simultaneously or by securing one end to another object 2. Before practicing, the hooks, handles, springs, and other parts of the equipment need to be inspected for any abnormalities 3. Practice should be conducted in a place outside of crowd 2m; 4. The movements during exercise should not be too fast or too vigorous. Importantly, when the equipment is retracted, the movement must be slow. This effectively trains endurance and also extends the lifespan of the equipment. 5. For bulk shipments via express delivery, we only guarantee that the goods are in good condition, but not the outer packaging or whether it is deformed. If you mind, please do not purchase. If you are concerned about the external packaging, please purchase the goods in full boxes and contact customer service to explain the situation and pay extra for additional packaging.