Quantum Storage Systems 2460SM-4 Inlay Mat for Wire Shelving Units, 24" Width x 60" Length (Pack of 4) Shelf mat for use with 24" x 60" (W x D) wire shelf (not included) Helps prevent items from falling through spaces between wires on shelf Made of polyethylene for strength and resistance to dirt and liquid spills Removable to facilitate cleaning Comes in packs of 4