These are the refills that I supply at shows for those who want the feel of a roller ball pen in a ball point. Due to the very low viscosity ink used in these refills they are as close to a roller ball feel as you can get, without purchasing a roller ball pen. They do not require capping as a roller ball does to prevent drying out. The MFG states that they are good for at least 1 year open to the air. Remember, quantity and price is for (2) each of the refills and include shipping by USPS standard mail. Be sure to specify blue or black, fine or medium when ordering.