Made of high quality aluminum alloy material. Attunement to the vibrational properties of our wonderful universe. It provides immediate deep relaxation and improves mental clarity and brain function. Improve your physical strength and mental concentration. Reduce stress by drawing your body into a central space. Develop and improve your sonic abilities. Enhanced massage, acupressure, dreaming and meditation. Balance your nervous system. Integrate left and right hemisphere thinking patterns. Ergonomic design, anti-corrosion, preservation. Designed for the perfect balance of instruments with high output and excellent craftsmanship. Material: aluminum alloy Colour: silver Size: 256Hz: 20x2.5x1cm / 7.8''x0.98''x0.39 '' 288Hz: 19x2.5x1cm / 7.4''x0.98''x0.39 '' 320Hz: 18.5x2.5x1cm / 7.3''x0.98''x0.39 '' 341.3 Hz: 18x2.5x1cm / 7''x0.98''x0.39 '' 384Hz: 17.5x2.5x1cm / 6.9''x0.98''x0.39 '' 426.6Hz: 17x2.5x1cm / 6.7''x0.98''x0.39 '' 480Hz: 16.3x2.5x1cm / 6.4''x0.98''x0.39 '' 512Hz: 16x2.5x1cm / 6.3''x0.98''x0.39 '' Hammer Length: 18cm / 7 '' Set of 8 pieces of harmonics spectrum contains the complete octave for tuning fork (C, D, E, F, G, A, B, C) These 8 tuning forks are based on: Root: C 256Hz Tibia: D 288 Hz Temple: E 320 Hz Heart: F 341.3 Hz Throat: G 384Hz Third eye: 426.6 Hz Crown: B 480 Hz High core octave: C 512hz Package List: 8 * tuning fork 1 * Hammer 1 * wooden box Please be aware of: