Yibuy Real Cattle Bone 80mm Bridge Saddle & 52mm Nut White for 6 String Classical Guitar Set of 2 Compatible with 6 string classical guitar. Made of cattle bone with a layer of wax on surface, It is a perfect natural material, work better than plastic. Lightweight design, exquisite appearance, and easy to use. This bone has minimal porosity and a great appearance. Its density and minimal porosity are features that yield good intonation and clarity,dropping them on a hard surface you can hear a difference in their resonance.