Pipe Pen Filler troublemaker-inks It features a 21K gold

It features a 21K gold nib

When growing up we only ever had white cotton candy so as a kid I was bit confused as to why were the cartoon ones pink

and features Ama-Iro (Sky Blue)

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Pipe Pen Filler troublemaker-inks It features a 21K goldTWSBI's Stainless Pipe extension has been designed to help you get to the last drops of ink around those awkward angles and bottle corners. Suitable for use with following TWSBI fountain pen models: Diamond series 580s, 580AL, 580ALR, 580RG, Diamond Mini, Diamond Mini AL, Diamond Mini RG Also fits the TWSBI converters: spring converter, traditional converter. (Top fitting standard international hole size)