ALUMINUM MATERAL: Non-magnetic, corrosion-resistant aluminum alloy construction for light weight and durability. | LONG RESONANCE: Extended long handle of turned smooth aluminum to facilitating bone conduction tests and more persistent ringing frequency. | FREQUENCY ACCURACY: Superior performance and consistent frequency accuracy. | APPROPRIATE CROWD - People who is easy to fatigue, insomnia, anxiety, uncoordinated mind, emotional instability. Energy therapists, students, children, meditator, crystal. | PACKAGE INCLUDE - A hammer to serve as a percussion tool, a soft bag storage and a piece of cleaning cloth to protect the tuning fork.