These seedling trays is extra sturdy and has reinforced sides. This makes them easy to move from the house to the greenhouse or garden. These trays also feature deep channel ridges on the bottom for better drainage and stability. They do not have holes in the bottom. Built to last a lifetime. The Maga Tray comes with one tray and has five different colors bright green, blue, magenta, lime green and orange color. Measures 10" W x20" L x 2 3/4" H. The Shallow tray has holes in the bottom for drainage and comes in three different colors bright green, magenta, and blue. It measures 1" x 10" x 20" in dimension.