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This seemed like a great idea with lots of reviews. However, it didn't work for us at all. The listing says, "Flexible Use: one size for ages 3 - Adult." I don't know if I'd agree. It did not work at all for my almost 4 year old son and was way to large for his hand. It also was loose on his bow and was flopping and moving around as well. Overall, it seemed to undermine the proper placement of the hand more than help due to this. Maybe this would work better for someone who is older, but it didn't work for us.
My 1st choice is for students to build the muscle to hold their bows without a prop. However, I run a 'premie' class for very tiny ones. And though they begin the class without this, I think it's a fine teaching aid for the super young. Their dexterity is still developing. And the grip helps with placement and relaxation. Give them a perfect bow hold.
I like it for my highly collapsable fingers! I'm double jointed and the either collapse with tension or lock. So this relaxes the finger that likes to lock. And keeps my thumb joint from inverting when gripping. Though I can manage without it, I am so much more relaxed with it. Cello is not my primary instrument, so I have not built the muscles around the bow hold from very young. But I am a music educator who can play the cello. ;)
Purchased for my 9 yr old in her first year of orchestra. The teacher was so impressed with it and the results that he had to have the website so he could request all parents buy them for the other students.
I bought this for a cello student of mine and I have to say, that it is much heavier than I was expecting and extremely hard to use. My student has small hands and couldn't get his hand around it. It made it harder to hold the bow rather than easier. Unfortunate :(