1. Silicone material, environmental protection, flexible and durable.2. Small size, light weight, easy to carry, can carry out finger rehabilitation training anytime and anywhere.3. At the beginning of the exercise, the trainer is put on the finger, and the finger is stretched out and forced to do the stretching and closing action. After two or three minutes, the finger will feel sour and swollen. At this time, the finger to the fingertip gets full exercise.Name: finger grip silicon ring exerciserColour:GreenMaterial:Silica gelPackage Contents:1 x Finger Ring ExerciserOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.