Metal tubes of 0.5 in are roughly double the gauge of the mesh wire used on folding crates, which is what makes this chew-resistant for a puppy that works on the bars. Wheels underneath let it roll between rooms without lifting 34.5 lbs. Interior space is 26 x 18 x 25 in behind an 11.5 x 24 in door, rated 88 lbs, and the top carries another 88 lbs as an end table. Overall it measures 27.5 x 20 x 33 in in metal and engineered board. Assembly is required and a manual is included.