I've shaved just about every day for about the last six years. I've always been really clean shaven, almost too much so since I have been told I don't look my age. I want to try something new with my hair, but it entails keeping that week-only half-beard. What do I buy to keep it at that length? Obviously I can't just take a razor and shave, I don't want to have to regrow it every seven days. What is the little tool called that I'm looking to buy to do this?