My colleague's acupuncture needles storage pouch, he doesn't use it on all his patients because they require long treatment time and energy, honestly I've only seem some of these needles in a museum, didn't know a lot of practitioners actually incorporate these needles in their treatment. He said that the thicker needles are actually less painful.... and some needles have blunt end....I guess I'll need to experience it myself to believe it 🤣