Medium point 0.7 mm gel pen refills blend detail with bold lines in a delicate balance Pigment-based gel offers vibrant ink color, ensuring that every mark is brilliantly communicated uni Super Ink technology forms a strong bond with the paper, preventing document fraud and check washing Use these ink refills to replace existing uni-ball 207 0.7mm gel retractable pen ink cartridges Available in black and blue These uni-ball signo 207 refills offer dark ink. uni-ball signo pen refills help you keep your pen running.