Aloha
I've been tying for a couple decades, both fish and salt water.
Most salt water flies are larger and easier to control the material.
Some smaller bonefish flies were a challenge due to rubber legs, smaller body material to mimmic shrimps and other sand dwelling creatures.
The bobbin has allowed me to tie fresh water flies, nymphs with these mitts I have as hands.
Perfect for smaller thread as well as larger threads.
Great tool at a great price.