Some people say they're pretty thin, but they're tinned copper and most of the other "thick ones" are just aluminum. So the range is great. I work on electric scooters and they look just like OEM. Now crimping machines are the same as ALL others available on the market. all complain about the ease of crimping and the need to use the next smaller size to get a good tight crimp, but for them - and almost everyone else - removing the lower jaws and flattening the top a bit is enough to grind / to file. Hundredths, so the upper matrix goes deeper into the lower matrix. THAT'S ALL. They work perfectly as they should, first crimp, correct slot size every time.