PP Material: The round cord stops are made of hard PP material, light in weight, not easy to break, no need to worry about rusting, can be used for a long time
Spring Loaded: The spring design of cord locks acts like a clamp that holds the cord tight so it won't slip out. It keeps your cord stays in place and doesn't slip out.
Instruction: Simply squeeze together to slide the cord lock freely up and down. When released, the tension tightens, keeping the cord lock in place.