Kay Chicago Blues diatonic harmonica. Are designed for beginners but are used by many true "professionals" Who must replace their harmonicas frequently due to constant usage. The Kay Chicago Blues 10 hole harp (harmonica), with well over 1, 000, 000 sold and played was first introduced in 1978 has is made with stainless steel covers, a clear Lucite frame, Hand tuned brass reeds, each reed is electronically tested with a strobe tuner for accuracy. The dense clear combs add stability and are more costly then the inferior black plastic combs found in most inexpensive harmonicas under $20. The reed plate is made of Top quality brass, Each tuned by hand and then tested electronically for accuracy of the Note and ease of vibration. Most imitators are made of tin or other substandard metals. The plated nickel/steel covers are engraved with the "Chicago Blues" Logo and are tight fitting to minimize air leakage compared to many "toy" Harmonicas who use plastic or aluminum to lower cost of manufacturing. The Kay Chicago Blues harmonicas is available individually in the keys of C, G and a have become the #2 Seller of 10 hole harmonica market, and the #1 Seller of 10 hole diatonic harmonicas under $10. 00. In 2012 Kay added the key of a to the line as a new harmonica for blues players. The Kay Chicago Blues harmonica quality has been proven over the years, with a failure rate of less than one in every ten thousand sold. Chicago Blues harmonicas are in the 's top 20 harmonica sales. Kay has made musical instruments since 1890. Also available in a 7 harp gift set with one of each of the major keys packaged with a velour lined gift/presentation Box.