It is very easy to fit and remove but stays firmly in place. I have used it on violins from 1/4 to full size and it works very well. It forces students with inconsistent bowing to bow at right angles to the strings in the one spot - not up and down the strings - and hence produce a better sound. It is the type of product you might lend to a student for a while, so having 2 or 3 on hand, if you have a few beginners, would be helpful. I strongly recommend this product.