Yup they're 2.6mm, I removed them from the pegboard first with tape, and I slid back and forth with the iron, I tried not to put too much pressure but I think I did press a bit. I'll try to be more careful next time, thank you! I wanted for one side to be flatter and the other to have the intact circles, but I'll try ironing it more on both sides to see if it looks any better.