Turn a single fork into a tone set by adjusting weights to match physicalpitched frequencies of the C-Major scale: 128C, 144D, 160E, 170.7F, 192G. Changing notes is a snap: Tine markings tell you where to position the weights to sound each tone. Crafted of precision-grade Duratone® aluminum for repeatable accuracy and durability. A great space saver.