Used with six-pack jumbo plug flats, square plastic pots, and biodegradeable pots, and other traditional inserts to create compact, efficient growing systems for bedding plants, pack sales, herbs, seedlings, and vegetable transplants. Lightweight injection-molded polypropylene construction with a uniform bottom mesh and ribbed sides offers the strength to support most inserts and small pots with the flexibility needed to hold up during use without cracking. Compatibility: Use with Pro-Trays, Jumbo Plug Flats, and Mini Square Plastic Pots. Dimensions: 10 1/2" x 20 7/8". Black.