With a nozzle it is possible to create different lines with syringe paste.
These nozzles are suitable for the silver clay in a syringe. The nozzles are available in different sizes.
If you change the tip change then keep the tip filled with silver clay so that you can change it again, grab it well with household foil with a drop of water in the large opening, wrap a damp cloth around and keep it tightly sealed in a pot.
With a sharp blade, the mouth can be enlarged if this is desirable.