This is the "Volleyball Net Setter Chain" from Tandem Sport. Function: A gauge for accurately measuring the height of a volleyball net. Features: It has markers for the four official net heights: men's, women's, mixed, and junior. Material: Made of durable ball chain and hooks. You can hook it onto the top of the net and see the height with the marker on the floor, eliminating the need for a large scale. Usage: Supports the accurate setup of net height. Used once. No stains or signs of use. I am selling it because I have multiple.