superior quality chinese medicine www.zythtcm.com Material and size: made of good quality stainless steel with an anodized coating, durable, reusable, rust-proof and not easy to fade; Size: the outer diameter of massage ring is about 2.5 cm/ 0.98 inch, inner diameter is about 1.2 cm/ 0.47 inch, fits for most people Function: these massaging rings can reduce anxiety, relieve stress, can promote the blood circulation of the finger in a certain extent, very suitable for students, office workers, etc. Easy to use: put the massage ring on the finger, scroll up and down, then the finger will produce pressure, so as to give the finger massage purpose; Our finger roller massager is elastic and suitable for fingers of most sizes