Still to be added, are the obvious commercial offerings including Mühle Silvertip
Fibre & Black
Fibre (Edwin Jagger uses these) and Kent / Simpson but also the likes
of Whipped Dog, The Golden Nib, Wolf Whiskers / Nathan Clark (Envy Shave) Timberwolf & Übersoft which essentially all
source from Yaqi, Oumo and both Alibaba and AliExpress at
large... But these are the most common artisanally - used to start off with.