This finger fidget coil provides a gentle massage as you roll it up and down your finger.   
Provides gentle pressure, promotes blood circulation, reduces stress and anxiety and increase attention.   Various sizes and colors to choose from.  Typical use on your pointer finger but may use for each finger and thumb.  

The diameter of the ring will be slightly smaller than your finger.   Made of stainless steel, measuring

Recommended use with children 6 and over.