This is a compromise pen and we would rather say so. A true flexible nib wants to be dipped, because no feed keeps up with a full flex stroke. What the Copperplate Flex does is give you about 60 per cent of that variation — from 0.4 mm unpressed to roughly 1.0 mm at the limit — in a pen you can carry. Push it harder than that and the tines will spread faster than the feed can fill them, and the line will go pale. That is the pen telling you its limit, not a fault.
The nib is a No. 6 in soft steel with long tines and a deep, narrow slit, set in an ebonite feed cut with extra fins to hold a reservoir. The body is 141 mm in deep violet resin, 22 g filled, with a flat-top cap and a flush brass band.
It wants a wet, low-surface-tension ink and smooth, hard paper. Write slowly. Supplied with a converter and two spare nib units.
