I have a Dean Markley that I just keep around for shits'n'giggles, I wouldn't recommend it for pro use but it gets the job done... it sticks on with some kinda putty, you can move it around till you find a good sound and stick it on... I always take it off when I'm done and I have to use goo gone to clean the instrument right away or the putty leaves a mark... it's the little round one about the size of a quarter with a decent length of cord attached and 1/4" jack, I think I only payed about $15 for it.