Listing of included forks and frequencies: Adrenals & Thyroid 492.80 Hz, Bladder 352.00 Hz, Blood 321.90 Hz, Bone 418.30 Hz, Brain 315.80 Hz, Colon 176.00 Hz, Fat Cells 295.80 Hz, Gall Bladder 164.30 Hz, Intestines 281.00 Hz, Kidneys 319.88 Hz, Liver 317.83 Hz, Lungs 220.00 Hz, Muscles 324.00 Hz, Pancreas 117.30 Hz, Stomach 110.00 Hz. This kit includes 15 tuning forks, and a velvet pouch Our tuning forks are made from a special Aluminum Alloy that is heat treated giving them a very pure tone.