Acoustic Guitar Bone Bridge Saddle and Nut by Creanoso Made of premium oxen bone, provides better tone than plastic material. Bone nut size: L 1.65" x W 0.24 "x H 0.33" Bone saddle size: L 2.87" x W 0.12" x H 0.35" Compatible with 40" 41" acoustic guitar. High quality replacement parts. High density and minimal porosity yield good intonation and clarity