12" x 12" cardboard egg crate flats provide additional surface area for your insects and increases the quantity of insects you can maintain in a single enclosure. These crates are 5 cells wide x 6 cells long and easily stackable.Cardboard egg flats replace substrate for roaches & crickets reducing the maintenance and making sorting inscets easier. Buy (8) which will fill an 18-20 Gallon enclosure and save,