Koa (Acacia koa) Guitar Top, Back & Side Set 200735 Wood has beautiful grain and is book matched. This set will do many different body styles. Approximate Back Dimensions- 20 5/16" long x 8 1/2" wide x .127"+/- thickness, per side of back. Approximate Top Dimensions- 20 5/16" long x 8 1/2" wide x .127" +/-thickness, per side of Top. Approximate Side Dimensions- 31 1/2" long x 5 1/4" x .104"+/- thickness, per side. Material is hit or miss sanded.