I got a jiibi jug* for my birthday!! I've got alot of practicing to do. This jug has a specialised tip, the musketeer model.
https://www.instagram.com/jibbilittle/
The jug makes a sharp thin line easily and has made some of the smallest rosettas I've ever poured with plenty of room in the cup for more pattern work for in depth and detailed pours.
These jugs are pricey, but worth it if you really want a high quality jug for latte art that will force you to expand your technique and grow with patient practice.
