HSS wire shelf liners are made of Flexible-Yet-Sturdy plastic and make a great addition to any wire shelving rack where small or thin items are stored. Shelf liners will provide a smoother surface for your rack and prevent smaller items from falling through. Each set comes with five polypropylene mats and fits on 16" deep x 36" wide wire shelf. They are designed for easy installation and care. Simply wipe with a damp cloth as needed.