Pure copper has springs Stainless steel has no spring Features: 100% new and high quality Convenient to use,the acupuncture probes are painless and can be used at any time. it's very convenient and the results are immediate. the handle is textured for easy and secure grip,smooth solid ball to portect against accident operate. Use for: as a pain point detector, acupoint detector, moderate pressure can immediately relieve pain. they are also used in auricular therapy, trigger point massager tool. Safe to use: has no side effects compared to other drugs for chronic medicine. it's light, so you can easily put it in your pocket when you need pain relief, facial tools of trigger point massage tool. Easy to carrt - easy carry, use at any time, suitable for the ear doctors and families for healthy care, trigger point massage tool. Quality - high quality stainless steel material manufacturing ensuring maximum durability, massage tool of trigger point massager tool. _x000D_