the angel tuners are a set of 3 crystal tuners. The angel tuners open our spirit to the angelic kingdom. They are based on the ninth octave of the overtone series. in the overtone series a fundamental tone creates a second tone the second tone creates a third tone and so forth. These tones are ascending in pitch. The sound will be delicate and high in pitch.these tuning forks vibrate at a frequency of 4096 hz 4160 hz and 4225 hz.about the productlength of the forks is ±10 cmtuned within a ±025% deviation margincomes in a blue velvet pouch size 12x10cmanodised aluminiumanodised aluminium has a protective oxide coating by an electric process in which the metal forms the gold anode. Since the anodising process is a reinforcement of a naturally occurring oxide process it is non-hazardous and produces no harmful or dangerous by-products. Anodised products have an extremely long lifespan and offer significant economic advantages through maintenance and operating savings. Anodising is a reacted finish that is integrated with the underlying aluminium for total bonding and unmatched adhesion.weighted tuning forksthese forks work more on the physical level.one can feel the vibration more strongly and at a deeper level when its stem is placed on the body. This is due to the weights at the end of each prong.the sound lasts longer but is softer and more diffused.they are heavier in weight.they are shorter in length than the same fork in unweighted type.these are excellent to use for pain relief reducing inflammation and inducing relaxation.they are normally placed on the body or by the ears.to tone them one can simply tap them on the palm of the hand or use the tuning fork activator.the weighted tuning fork has round weight at the end of each prong.unweighted tuning forksthese forks work more delicately on a subtle level.they move in a physically lesser motion. The feeling of the vibration is more subtle when its stem is placed on the body.the sound does not last as long but is sharper and more crystallised.they are lighter in weight.they are longer in length than the same fork in weighted type.these are excellent to use for mental and emotional balance improving the energy field improving physical health and promoting spiritual uplifting helping to create inner harmony and wholeness.these forks are placed around the body or by the ears.to tone them one could gently tap two forks together or strike them on the tuning fork activator.the unweighted ends are straight.