there is a steel ball weighing about 76 grams inside that can be used as a self-defense weapon when facing danger by opening the rope at the end. If necessary, it can be disassembled and used as a piece of rope (with a diameter of 4 millimeters and a length of approximately 3.6 meters) for towing and emergency treatment. The materials used are special for umbrella ropes. Like ropes used for sea going ships, they have the advantages of corrosion resistance, aging resistance, etc. The single rope tension is about 280 kg!