The non-skid mesh stuff works very well. BUT...don't store it in your case next to your instrument. It can do nasty things to the finish on long contact. I keep my squares in my tote bag along with the music, and try to remember to wipe the back of the dulcimer after I've been using them. Fortunately, I find that I can often dispense with them if the chair is the right height or my clothing is of the right material.