mine is made out of MOSTLY ash wood from my backyard. cleaned with bleach water. then their is a peice of crab apple wood also cleaned with bleach and water. and one peice of normal apple wood from my uncles house, cleaned with bleach water. none had pesticides. i acually wwouldnt sandblast it. some parrots like to rip the bark off themselves. i only took the bark off the crab apple because the bark was kinda natsy. the wood was fine though. i dont think there is a "best" wood. if you think your bird will constantly chew the perchs instead of the toys, you can use a harder wood to make them last longer. but as long as its safe it should be alright. like i said, i made mine out of ash, crab apple and apple. and it works great. i also have a grapevine T-stand. that is good too.