What do you use them for? The most common bonsai tool I use is a reciprocating saw..... I'm just not as refined!
I have a lot of pines. So, obviously I pull needles. But, I use them for wiring, too. When I’m manipulating branches to get my hands in the tree, sometimes twigs, or needle bundles are in the way, and I need to gently push them aside. I can reach inside the canopy with the tweezers since they’re long and slim, and wont do any accidental damage to the tree or needles.
Also, when wiring, er... actually, when bending after the wire is placed, on small twigs, I find i can make a more precise bend using the tweezers as leverage than I can with fingers. I’ll slip the open tweezer over the wired twig, and leaving them open, I put one tine where i want the outside of the curve to be, and use the other tine to push the twig. To do this, I “spin” (apply a twisting motion) to the tweezers. I do this a lot when wiring JWP. Especially when setting the bottoms of the pads. I can set it so that when seen from the front, the viewer can just barely see the brown twigs supporting the green foliage above. It’s easy to sit back, slip the tweezers in, and give them a slight twist, and position those branches.
Other uses for tweezers include removing excess buds off Japanese Maples and Dawn Redwoods. When pulling needles on JBP, and doing fall clean up, sometimes where the new summer shoots have grown in and produced more than two new shoots. Sometimes those excess shoots are weak enough you can eliminate them by breaking them off with the tweezers, and not have to cut them off with scissors.
I use them to pull weeds.
Just, all kinds of things.