Knucks is basically a 4x6 sheet of pure gangsta. Mix and match the four letter phrases to create unique statements on your knuckles. With 22 words per sheet, you can create 11 full, two hand knuckle messages with each sheet. Knucks takes fist bumps to a whole new level. Size: 4"x 6" Tattly are safe and non-toxic, lasting on average 2-4 days. We suggest placing on oil-free areas where skin does not stretch and keep them clean!