Seirin Needles are ultra-thin, stainless steel wire needles that provide gentle, painless and stress-free treatments. They are some of the best quality needles on the market. Made in Japan, The Seirin J-Type Needle is used in acupuncture for gentle, painless, and stress-free treatment. Made from high-quality surgical stainless steel, the acupuncture needles can be used to relieve pain in your patient's muscles.