Say goodbye to pain, calluses, and swollen thumbs. With a groove to secure the string and a wrist band that prevent the ring from sliding off, Ali bow's "Shallow Hook" painless ring will give you a whole new experience.
 
The ring's design is based on the rings during the Zhou dynasty (1046BC to 256 BC). These rings require a "Shallow Hooking" method, involving bending the thumb as little as possible. If used properly, these rings can be without any pain, and the release with be very crisp.

Pre-made sizes. Largest thumb circumference is 75mm. 
 
If your thumb size is larger than 75mm please get this customized ring: here.