All perches are constructed with the same base materials and high quality craftsmanship, on all perches we use 3/4 “ pressed board with heavy duty counter sink pre-drilled 3/4” metal anchors, that are sure to stay in place and hold the perch tightly against the supporting post, we have 4 Different perch types, unfortunately we do not mix and match orders. Most of our small tree perches are 12” in diameter, All larger trees have 14” perches, please view each individual tree for full details.