Made from Japanese zelkova. It's slender. The length and thickness are listed in the second photo. It's completely pesticide-free, so there are many insect holes. I've cut or shaved off those parts, but there might still be some subtle traces of insect damage. However, I will check them as carefully as possible. I think it's gentler on birds than wood that's been overly treated with chemicals. Since natural wood is used, there may be warping, knots, stains, cracks, etc. This is a handmade item by an amateur, so there are some imperfections. If you are looking for perfection, please refrain from purchasing. Thank you. Natural wood Perch Parrot Bird athletic Java sparrow