2 Pack of Schmidt easyFLOW9000 Blue ink Refills. These refills glides more easily over paper that any other writing system provided the paper is free of "Hand Oils". The ink is very sensitive and the paper must be 100% clean. The ink flow starts instantly like never seen before, you get a writing that is regular, strong, prices and clean. Just be sure you do not allow the paper to become contaminated with hand or body oils. Warning! EasyFLOW9000 ink will not Adhere or Stick to paper that contains hand oils!