There are lots of diffent techniques!
Emboss - use stamps to imprint the letters. U can the leave them, dust, paint or pipe over.
Piping - dirrectly onto the cake.
Piping - onto paper, then let the icing/ chocolate dry, an apply to cake.
Cutters - not available that small, but could also be why u have seen.
xx
I often use the Wilton tubes of colored icing and a small tip 2 or 3. Just have to write very carefully.
I was meaning cutters like tappits, although it depends what the op means if they are a good suggestion or not.
xx
Quote by @%username% on %date%
%body%