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WARNING: This only works if you are able to remove the frog of your violin to install it. The frog on my son's violin doesn't come off, so this was a $30 mistake and waste of money. They should anticipate that BEGINNERS won't know that not all violin bows will be compatible with this before selling them a $30 piece of plastic.
Additional, I was able to get this on a different bow (that is too big and heavy for my son to use), but found that it's impossible to put a bow securely in a case with this attached. So you would have to disassemble your bow to remove it to put the bow away, then disassemble the bow and reattach it and readjust it (NOT easy) every time you wanted to play. There have to be better solutions than this. I can't believe I just paid $30 for a piece of useless plastic.
Editing this down to a 1 when I remembered that I contacted the company directly for support and never heard a peep. This is a true scam.
I could not use it... it was not fit for a half size bow. I even tried to cut the circle of the thumb/index support to make it bigger, and it still did not fit. I wasted 30 dollars. I do not recommend for half size bows.