Cleaning needles 0.4 mm are supplied separately from the rest, but all other needles are mixed. Only 2 needles had a loop as shown in the example. I had to take a picture of the needles and zoom in to try to distinguish between the different sizes (and even then I'm not sure I got it right). Supplies must be packaged so that each size can be easily distinguished. The human eye cannot readily distinguish between two needles that differ in thickness by 0.1 mm.
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