This Mini Harmonica by House of Marbles has a complete diatonic octave in C-major, plastic comb interior, 4 Holes, 8 Brass reeds, & stainless steel covers. Measures 1.5in x 0.5in. You can actually play a little tune with this little instrument! Includes keychain hardware. Available in silver, red, & blue; one color will be chosen for your order at random. Ages 6