1.One Time Self-locking Design: Once inserted into the lock hole, it automatically locks and can only be opened by cutting and breaking, providing clear physical evidence of whether it has been tampered with. 2.High Strength and Durable Material: Made of tough nylon plastic, it has good tensile and weather resistance and is not easily broken due to environmental changes. 3.Long Size Design: The total length is about 250 millimeters (about 25 centimeters), providing sufficient length to pass through various lock holes, handles, or valves, with a wide range of applicability. 4.Main Application Scenarios: Sealed fire extinguishers, fire hydrant boxes, emergency equipment cabinets, electric meter boxes, water meters, gas meters, mechanical equipment, calibration instruments, sealed containers, container doors, warehouse door locks, and bagged goods are used on samples, document bags, or evidence bags that need to be kept in their original state to ensure their integrity. 5.Easy to Use: Thread the thin end through the hole that needs to be sealed. Insert the thin end into the lock until it locks with a "click" sound. The seal number can be recorded on the blank label for inspection purposes. To open it, simply cut the seal. Package Contains: yellow blank numbered tamper proof seal (250mm) x 100 pieces