I talk about the thick ringed osage a lot , but I have staves from half inch rings to 1 mm thick, In my line of work it pays to have every kind,I have been selling staves since 87 It always amazes me to watch people pick through my staves,what one person tosses aside the next guy along will grab first, one guys trash is a nothers treasure, I study the bark before I cut a osage, with enough practice you can tell a lot by the bark, you want a real healthy looking bark, the bark that tends to be rusty in color and you can rub from the tree with your hand usually no good, when in doubt cut a small notch from a corner of the tree and look at the rings before you cut the tree down,