Staedtler Triplus Mobile Office Multi Set/Fineliner/Pen/Micro Sharp/Text Surfer 

4 kinds of essential office pen
Tripllus Fineliner Black
Tripllus Pen Blue
Tripllus Micro Sharp 0.5mm
Tripllus Text Surfer Yellow
Ergonomic triangle design minimizes handwriting fatigue
Portable mini mobile office
Stand-up Steadtler Box