These are 8 Harmonic Tuned Pipes. These 8 Tuned Pipes are based on- Root Red C 256 Hz Sacral Orange D 288 Hz Solar Plexus Yellow E 320 Hz Heart Green F 341.3 Hz Throat Blue G 384 Hz 3rd Eye Indigo A 426.7 Hz Crown Violet B 480 Hz Higher octave of Root Red C 512 Hz. These are 8 Tuned Harmonic spectrum Pipes. They create a series of overtones to help you relax and centre yourself. Each Pipe relates to a different state of consciousness and body posture. Each Pipe affects your nervous system in a different way by activating specific elemental qualities.These Pipes are tuned such that they are more in touch with the physical plane of existence of our body. The physical plane is more concentrated, crystallized in definite form, cognitive and revolves around around the 5 human senses and various parts of our physical body like the tissues, fluids, bones, organs, etc. This set produces pure sounds and overtones, the effect of which is to help relax and centre oneself. It gives instant relaxation and altered state of consciousness.These pipes are made from High Quality Heat Treated Aluminium Pipes producing beautiful and long lasting sound.Carefully tuned to actual frequency as mentioned.Gives Great healing effect.Dimensions of Pipe-Length – 21 to 30 inches appx,Diameter – 1 inch appx..Packing- 8 Piece Pipe with Rings on each side,1 Wood Hand Stand to hold 2 pipes at one time,1 Rubber Mallet. You can hang these Pipes on Wooden hand-stand with the help of Rings provided on sides of the Pipe.Use Rubber mallet to produce healing sound and frequency.