Purdy,
Think of Yaks like cows that live in high altitudes. They are raised as beasts of burden but also for their meat, milk, hair, skin (leather), and every other part that can be used, including the horns. Yak Horn is a byproduct of a "farmed" animal so you can use it without guilt unless you are personally against killing animals for use.
As to whether or not they are good....I was wondering that myself since I am trying to get away from plastic combs.
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