TrippNT Lab Storage Shelves are ideal for benchtop or cabinets. Made of rugged, chemically resistant PVC. Safety lip keeps bottles, glassware and other items secure. Strong but lightweight and easy to move. Can be washed, bleached or cleaned with low molecular weight solvents. Bright white PVC adds clean look to lab. 24" long shelves with safety lip with angled sides for easy "in and out". Bottom shelf is two inches wider than middle shelf. Middle shelf is two inches wider than top shelf.