These wide-mesh bottom trays are ideal for soil block propagation. With just enough flat mesh to evenly support all sizes of soil blocks, even the mini 3/4" blocks, they allow air pruning of roots to occur on all sides of the blocks. Trays are made from 100% recycled plastic and may show some variation in mesh thickness. 10 5/8" x 21 1/4" x 2 1/2".