EasyFlow's unique ink formulation gives that smooth writing sensation normally associated with "wet ink" rollerballs, yet it lasts almost three times longer. In blind tests, conducted with the general public at the Spirit of Christmas and Festive Fair shows, over 75% preferred writing with an EasyFlow. The life of each refill is dependant on your personal usage but the write out length, as measured by the EWIMA is 2800 metres.