Introducing the DV HR Alto, the first hard rubber mouthpiece to feature the patented DV design. When Jody Espina first applied the Golden Mean (Phi) proportions to the design of the DV series mouthpieces, he created one of the most sought-after mouthpieces in the world. Now for the first time, those magical proportions are available in a hard rubber mouthpiece. The DV HR is very free blowing, with all the power you will ever need, along with that big bottom for which the DVs are famous.