For Gibson® and classical guitars 4-1/4" x 15/32" x 9/64"(107.95mm x 11.91mm x 3.57mm) 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. Blank saddles have oversize length and height, for custom shaping in your shop. Theyre ready for trimming, filing, sanding and slotting.