These strong pet kennels are made of strong steel and stainless. This is a superior product designed specifically to help those who have large and powerful dog that is able to scratch and make a way out of the cage. Almost all sections of these pet kennels forged from high-grade steel, so as to ensure that your dog will not be able to get out of this cage. In the design with the addition of wheels on the legs of the cage that can facilitate you to move it anywhere throughout your home section. For more information about this strong pet kennels product steel cage, can be seen on their site.