Blisstime 2 Sets of 4pcs 6 String Acoustic Guitar Bone Bridge Saddle and Nut Made of Real Bone Made of real cattle bone, which can offer a better tone than plastic. Bone nut size:43mmX6mmX8.5MM Bone saddle size:72mmX3mmx9mm Package includes 2 pcs nut and 2 pcs saddle. Many luthiers and guitar manufacturers prefer bone guitar nuts for their instruments. The bone we offer is oxen bone from China. This bone has minimal porosity and a great appearance. Its density and minimal porosity are features that yield good intonation and clarity.