Grover's new Roll Ring™ is designed to aid concert percussionists with the execution of thumb/finger tambourine rolls. This circular ring helps players easily create the friction needed to produce a smooth, even sounding roll. The 1" wide band is specially shaped to conform to the outer edge of a headed concert tambourine. It has a special non-permanent adhesive backing that makes it super easy to put on and take off in seconds! The Roll Ring is reusable and can be applied and stored numerous times.