Here's what the back of the box says about the MS-Series Hohner Blues Harp:

This harp is engineered for consistent volume and tone when used for intense blues playing. It can hang with the toughest players on their most serious gigs. With a dirty, dark hard rockin' sound, this harmonica's unique tuning emphasizes all the besst qualities of blues harmonica playing. MS components are interchangeable, allowing you to create a combination to suit your taste.