Gray Things 4 Strings CelloPhant Award-Winning Cello / (French-style bow) Bass Bow Hold Teaching Aid 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 Size helps an open, relaxed hand Index finger rests on bow normally Directs thumb toward intersection of frog and stick with Alternate thumb placements for young hands Pads of fingers have choice of resting places Adds a touch of weight for fuller tone Flexible Use: one size for ages 3 - Adult Fits all bow sizes Made in the USA Manufactured of the finest medical grade silicone rubber No latex allergy concerns Durable &amp; Dishwasher Safe