These perches are made from natural growing Manzanita wood, and shapes will vary from perch to perch. Each perch is made based on the width of the branches and cut to an average length, giving them a distinct small, medium, and large size. 
 
 
 
Small length: around 14"
 
Medium length: around 18"
 
Large length: around 22"
 
 
 
Natural Manzanita perches still have the bark on. This gives your bird bark that it can strip off, but the wood underneath is incredibly strong and should stick around for quite some time. However the bark left on does make the perch a bit harder to grab and might not be the best for very young or very old birds.