Our kiln-dried Madagascar Rosewood, Master Grade fingerboard has flat undersides, is unfretted (no inlays), and is ready for trimming to fit a variety of neck widths. This slotted fingerboard for Martin Guitar features: 25.34" scale 16" radius 20 fret slots Slotted for Martin Dreadnought guitars, this is the most common acoustic scale length. Note: Martin Dreadnought scale is commonly referred to as 25.4" but is actually 25.34". Fingerboard specs: Approximate dimensions: 2-1/2" x 18-3/4" x 15/64" (63.50mm x 476.25mm x 5.95mm) Radius: 16" (406.40mm) Fret slots: 20 slots, 0.023" wide (0.58mm) Scale: 25.34" (643.64mm) Madagascar Rosewood, Master GradeMadagascar Rosewood (Dalbergia baroni) is the closest commercially available substitute—in both tone and visual appearance—for Brazilian Rosewood (Dalbergia nigra). Our Master Grade offers strong variegation, black ink lines and color contrast from golds to browns to blacks that make many of these boards virtually undistinguishable from their Brazilian cousins.