Grover Pro Roll-Ring 10 in. Roll-Ring 10 in The Roll Ring by Grover Percussion is a circular ring that 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 The Roll Ring by Grover Percussion is a circular ring that helps players easily create the friction needed to produce a smooth, even sounding roll