These gel highlighters are also commonly known as bible highlighters, because they are made out of gel not liquid ink. They do not dry, do not bleed through thin paper, nor do they smear. Beautiful vibrant colors, super smooth glides. Assorted colors are perfect for color coding, decoration and highlighting. Twist the end clockwise to extend the gel highlighter, counter clockwise to retract. Each pack includes 12 highlighters in 12 colors.