Waterman ballpoint pen refill suits most full size Waterman twist action ball pens and can also be used in select Waterman rollerball pens like Expert lines, Phileas lines | Provides you with the highest standard of ink which ensures supreme performance and guarantees a comfortable writing experience | Waterman pens produce flawless lines that won't dry out over time | The smooth flowing ink will give you a very comfortable writing experience | Waterman ink has been designed to perform