Many luthiers and guitar manufacturers prefer bone saddles for their instruments. Bone is the traditional choice for making saddles on quality acoustic guitars and are usually standard equipment on high end instruments. Bone's hardness and density contributes to good tone, it polishes well, and it allows more precise slot filing. And this Preshaped saddle will save you a LOT of work — a head start for the novice builder, and a bonus for the busy repair shop where time is money! The dimensions have been carefully researched, and minor trimming, slotting, and sanding are all that's needed to fit most popular guitars.