If you have older, plain, or home-made pitched instruments, you can include them in your Boomwhacker or bell activities by applying these colored labels. Simply print, cut out, and apply them with a piece of tape slightly larger than the label. If you have access to sticky-backed printing paper, this will save you the hassle of cutting and applying tape. However, tape gives protection to the label, so it may last longer. When using tape for label application, I have found that Scotch Magic Transparent tape (specifically this brand) is less likely to get gummy.