Staedtler triplus Fineliners - Assorted Colours - 48 Packtriplus fineliners are designed for writing, journaling and creative projects. The triangular barrel is designed to ensure a comfortable writing experience, especially for those who do a lot of writing. triplus fineliners are characterized by their fast drying water based ink and are therefore particularly good for writing on paper as the ink does not show through or smudge! The superfine 0. 3mm metal clad felt tip is a popular writing width.