Hohner PENTA-GM Harmonica Key Of G MinorBased on the well established Special 20 harmonica, the perfect beginners instrument thanks to its ABS comb and recessed reed plates. The tonal layout is the minor pentatonic scale with the added blue note, so no bending is needed to play the blues scale. Specifications Reed plates (material, thickness): brass, 0. 9 mm Reed plates (surface): brass Reeds (number, material): 20, brass Comb (material, color): ABS, blue Comb (finish): ABS Mouthpiece