Our Active Aqua growing trays come in two popular sizes and make growing easy with their versatility and solid construction. Advanced channel design eliminates blockage and standing water to ensure proper and prompt drainage. They are perfect for holding Rockwool or Stonewool slabs, Hugo Blocks, Sure to Grow, or any loose growing media like peat, perlite, or starter cubes. You can also place planters into the trays. Outside Dimensions - 40.75" x 9.75" x 4.5"