The Sure Roots 50-cell, 5-inch deep Forestry Tray is specifically designed and engineered to drive root growth downward. It promotes healthier, hardier roots on nursery seedlings, ornamentals and propagated perennials. A new 38-cell, 5-inch deep tray is being introduced this summer. Trays are made from 100-percent reclaimed plastic and are recyclable after use.from T.O. Plastics, Inc.