2 Extra Forte3D® “Jaunty” Wolf StoppersA common problem that all cellos face is the undesirable "wolf tone" that can occur when certain frequencies over vibrate, manifesting as a stuttering effect. Interestingly, the most expensive instruments in the world (think old Italian) usually have the worst wolf notes, since the instrument resonates so strongly. We've encountered the same issue with carbon fiber cellos, so we designed our own wolf stoppers to reduce this disruptive howling sound.