i have a beardstache and like to keep my beard at 1 mm. however, there's an area under my lip that is much darker and thicker, like the hair of my mustache. even when i shave it with 1 mm, it still appears much darker than the rest of my beard and this makes me low key crazy. enter the zero blade.. with the zero blade i was able to match the area under my bottom lip to the rest of my beard. for years i had to clean shave this area every three days and i didn't love the look of it being clean shaven but the only other choice was to have it appear thick. until the zero blade, i was always choosing between the lesser of the two evils. oh and it's also a great product to use to edge your beard. thank you, brio!