This Insect Rearing Cage uses very fine 150 x 150 mesh Nylon netting that effectively keeps aphids, thrips, and parasitic wasps from escaping or entering the cage.The insect cage is L12 x W12 x H12 inches, making it a perfect fit for lab selves with limited space.The insect cage is very easy to assemble by simply connecting poles with splints.The all mesh side panels are of fine Nylon netting (150 x 150 mesh) for ventilation. There is a 5.5" diameter sleeve opening in the front panel for addition or removal of insects and for replacement of food material.The framework insect cage is of lightweight a stainless steel frame and constructed outside the enclosure. There are no places for insects to hide inside the cage.