wood, such as cherry or white oak, or they will not stay in tune well. Some pin block woods come from endangered trees. Some specialized plywoods can also be used (piano pin block stock or the die maker's ply used for rotary dies).

Threaded tuners are durable, will take very high string tensions. They do not push outwards on the hole and wedge the wood apart, which can reduce the risk of splitting it. They can be set in blind holes,