The Grand General Closed Back Rubber Mounting Grommets are made of cold-resistant PVC with Thermal Plastic Rubber (TPR), ensuring durability in various weather conditions. Specifically designed to fit large rectangular LED lights, these grommets feature a closed back water tight design that helps prevent water damage. Sold individually, they are specifically designed for Grand General LED lights. With their practicality and ability to protect against water damage, these grommets are a reliable choice for any LED light installation.