Alternative to styrofoam Speedling trays, these stackable trays are made of heavy plastic and are very sturdy and durable. Heavy plastic makes them easy to sterilize and clean, helping to eliminate pathogens. Square cell walls are smooth, allowing for easy removal of transplants. Available in 2 sizes. Larger size cells are great for most crops, including tomatoes and broccoli. Smaller cells allow for higher density plantings of crops like basil. Tray is 26.5" long x 9" wide, individual cells are 1" sq x 2.5" deep.