The standard harmonica for Blues - a Blues Harp - is generally similar to a Hohner "Marine Band" style such as a "Blues Band" or "Pro Harp" etc. - there are many, very similar but slightly different construction and materials. Each has a limited number of notes, you have to select one to suit the key you are playing in. Examples: http://www.amazon.com/Hohner-562-Harp-MS... http://www.amazon.com/Hohner-1501BX--Blu... http://www.amazon.com/Swan-Holes-Diatoni...
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