Additive Pens Double Helix and Ribbon Fountain Pen Review

These pens were kindly lent to me by Additive Pens.

Length (capped): 169.3 mm/6.66″
Length (uncapped): 150.4 mm/5.92″
Length (posted): N/A
Diameter (section): 10.1 – 12.0 mm/0.40″ – 0.47″
Diameter (barrel): 12.8 – 17.1 mm/0.50″
Weight (all): 25 g
Weight (cap): 15 g
Weight (body): 10 g

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