Ho'okipa koa concert #57: Regular concert, 15 inch scale length. "Zebra", this instrument named itself! Top, back, and sides have distinctive alternating dark and light premium Hawai'ian koa with sapwood providing the light striping. This is truly one-of-a-kind. Rosewood fretboard, koa bridge. No binding, making this model the least expensive koa instrument: regular concert size without binding.