Every detail has been considered. Only the finest materials are used. Oversized, chew resistant, kiln dried hard wood is carefully hand crafted, sanded and corners rounded. Parts are wedge assembled with stainless steel pins and deeply recessed screws. PVC ladder rungs are finely ribbed to provide a positive grip. Easily cleaned formica covers base surfaces. All parts are handmade and personally inspected during construction and prior to shipping. Acrobird products are completely non-toxic and free of glue and chemicals. You will be pleased and proud to own Acrobird structures and your bird will have a smile on its face.