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The design of this is so much more effective at learning straight bowing than other similar products I've tried. The fact that it is rounded and low profile lets you bow normally (e.g. all the way to the frog) and also allows you to really assess whether your bow is straight in relation to the two sides. I rated this a 3 instead of 4 stars because it is just barely big enough for my 4/4 violin. Because of this, it would definitely scratch my violin because the fit is very tight-- I solved this by wrapping the "feet" in multiple layers of plastic wrap which is doing the trick.