Upgraded with a new 2 part slider system the Discovery is by far the best 12 hole chromatic harmonica on the market. The 2 part slide mechanism, gives the harmonica a much better slide action, but it also give the player better response and dynamics. Are you looking for a harmonica with incredible volume, perfect response and a smooth slide action, then you do not have to look any further! Exclusively available from J.A. Harmonicas.