The same Private Reserve ink you love in the bottle is also available in short international cartridges (also referred to as standard cartridges). These cartridges fit all pens which accept short international cartridges including Pelikan, Dani, Delta, Reform, Senator, Conway Stewart and others. Each package contains 12 cartidges, and the package is very well designed with slots to hold the cartridges and is a convenient size to carry in a briefcase, purse or pocket. Price is for one package of 12 cartridges. (list price is $5.60).