Uni-Ball 307 Retractable Gel Ink Pens, Medium Point 0.7mm, Pack of 6 (Red) The Signo 307 expands upon the highly popular 207 with a redesigned tip, aimed to deliver dense colour and provide skip-free writing, making it perfect for situations where speed is a necessity, such as note-taking. Features Uni's high quality "Super Ink", which is not only water and light resistant, but also "Tamper-Resistant", meaning that the ink cannot be washed off using chemicals and solutions used by people to fraudulently modify documents. The 0.7mm nib delivers a fine 0.4mm line. Pack contains six Red coloured inked pens.