Holds a month of breathing and performance assignments or progress notes. Comes with a soft, waterproof cover and is small enough to fit into almost any instrument case. Each PowerLung Performer Series model comes with one (1) Practice Journal.Refills are available in quantities of 4 or 10 Practice Journals. Refills come with one (1) soft, waterproof cover and additional covers are available in quantities of 4 or 10.Technical Information: Len...