Benefits: -Flexes thumb to touch intersection of frog and stick -Softly rounds and relaxes index and middle fingers -Postions index finger to rest on bow -Adds a touch of weight for fuller tone -Universal Fit -- for child to adult hand sizes Features: -Fits all bow sizes -Made in the USA -Manufactured of the finest medical grade silicone rubber -No latex allergy concerns -Durable and Dishwasher Safe