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The TWSBI GO is the most affordable TWSBI fountain pen yet! A unique feature of this model is the spring loaded piston. This pen has a translucent smoke grey body and clear grip section, so you can see your ink and the spring piston mechanism at work, and has a clipless push/snap cap.

TWSBI Go Fountain Pen - Clear - Extra-Fine

Vacuum-Filling Fountain Pen Fine Nib Acrylic Large-Capacity Inking Pens Disposable Fountain Pens Smooth Writing Pens - AliExpress

New Resin Transparent Vacuum Fountain Pen Quality EF/F Nib 0.38/0.5mm Smooth Ink Gift Pen for Office Business School

Yongshen 601 Vacuum Filling Fountain Pen Writing Stationery Office School Writing Ink Pens Visible Window With Gift Box Supplies - AliExpress

Vacuum-Filling Fountain Pen Fine Nib Acrylic Large-Capacity Inking Pens Disposable Fountain Pens Smooth Writing Pens - AliExpress

majohn M2 plus Fountain Pen F Nib Transparent green Resin Ink Storage Large- Capacity Practice Pens Office Students writing pens - AliExpress

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Fountain Pen Unbranded Transparent Clear Eyedropper Fountain Pen 0.38mm 0.5mm Nib Fountain-Pen Pens