We hand make all our adjustable horsehair bows out of Maple, Cherry, and Walnut. We offer all three options in our store, so choose whichever one matches beautifully with your psaltery. This bow is our "regular" length, measuring 15". We also sometimes have bows made out of various exotic woods (call or email for availablility). The tension of the horsehair is adjustable with a violin-type peg.