English: Fountain pen flexible (semi-flex) nib made in 2016. This example is a № 10/#6 Indian chrome plated stainless steel Ambitious semi-flex nib (the oblique cut nib slit is intentional for maximizing ink flow). The nib bases and bodies of Indian № 10 nibs are optimized to fit on 6.35 mm (¼ in) diameter feeds. The Indian № 10 nibs often will fit on 6 mm diameter feeds. #6 and № 10 nibs are approximately 35 mm long.