Globally recognized for superior craftsmanship and meticulous attention to detail since 1983, Lee Oskar Harmonicas pioneered an interchangeable and replaceable system of reed plates, combs and cover plates that has become the industry's gold standard. The Lee Oskar Harmonicas System features four distinct harmonica models in standard and altered tunings, available in multiple keys, for playing many different musical genres. Cover Plates (model #1910CP): The Lee Oskar Harmonicas System provides interchangeable parts for easy disassembly and maintenance. Replacement stainless steel cover plates are corrosion-free and attached with only 2 nuts and bolts (included) Fits all Lee Oskar Harmonicas.