The C & G Tuners are 2 Tuning Forks. They are based on the Pythagorean or Just Scale, also known as Whole Body Tuners. These are C 256 and G 384 Hz forks. All our Tuning Forks are made from special grade Aluminium alloy and frequency is guaranteed to tuned to an accuracy of +/- 0.25% which is very good for healing.