Nothing special! The key is that the core material is preferably soft iron. As for the number of turns, it depends on what kind of wire is used. Thick wire can be wound less, and thin wire should be wound more! Anyway, the total cross-sectional area is roughly the same! If conditions permit, of course, the coils wound by the machine should be better, because the mechanical force is even, and there will be no uneven force like the manual winding! "Don’t Believe It Easy to Believe in the Vending Machine Stickers in Post Bar", there are a lot of support in it. If back and forth, then a few people will keep posting pictures and compliments in it, and attack when they hear the language that others oppose. Therefore, we should pay more attention to the vending machine stickers that mislead novices. When buying a machine, it is necessary to verify the other party's machine. To choose a reputable manufacturer, you can inquire about the famous masters. This way you will not be fooled. Don't be superstitious about the rumors that the machine is supreme, as long as it is a stable machine, it is a good machine. No matter how good the brush is in the hands of a novice, it can't draw a good picture. In the same way, in the painter's hands, you can draw amazing pictures with chalk, and your tattoo skills are the most important.
