For Gibson® and classical guitars 4" x 13/32" x 1/8" (101.60mm x 10.21mm x 3.18mm) 10" (254mm) top radius with B-string compensation Stewart-MacDonald is your source for quality bone! Bone is traditionally favored for quality instruments. Our unbleached bone is even harder than bleached white bone, and has a mottled cream vintage look. Its hardness and density contributes to good tone, it polishes well, and it allows more precise filing. Shaped saddles will save you a LOT of work—a head start for the novice, and a timesaver for the busy shop. The sizes have been carefully researched, and accurately radiused, so that minor trimming, slotting, and sanding are usually all youll need to do.