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TWSBI GO Fountain Pen - Sapphire Nib Size:Medium Gain tips and insights fromTWSBI Go Fountain Pen Sapphire The TWSBI Go Fountain Pen features a new spring loaded piston that fills up quickly and easily. Dimensions: Capped 13. 3 cm (Posted 17. 1 cm) Weight: 16 g For more about the pen, please check out our blog. *If you're not quite sure what nib size is the right one for you, we hope our TWSBI nib size comparison post will help too!