Medvibe Technology Octave Tuning Forks (Set of 4) Get hands-on experience with resonance and pitch with this set of tuning forks Perfect for classroom demonstrations, music classes, or science lessons Help peak students interest in acoustics Forks range in length from 7 1/4" to 8 3/4" Includes one fork each of C-256 Hz, E-320 Hz, G-384 Hz, and C-512 Hz