The Hosco Unbleached Bone Martin Style Compensated Acoustic Saddle is a great option to replace or upgrade Martin or similar size acoustic guitar saddles, it is fully compensated to help improve intonation. Bone is the traditional material used for nuts and saddles and these are unbleached bone which is harder than bleached making it ideal as a saddle material, shaping is more precise on the harder material and there's better transfer between the strings and the soundboard.