Set of 2 Heavy Duty Tuning Fork with Resonance Box and Hammer Sympathetic 16.5cm (6.5") Tuning Forks 440Hz Rulers 20" x 26" heavy paper

20" x 26" heavy paper laminated with grommets

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It has a movable protein molecule for free rotation in both longitudinal and lateral directions

4mm terminals

Set of 2 Heavy Duty Tuning Fork with Resonance Box and Hammer Sympathetic 16.5cm (6.5") Tuning Forks 440Hz Rulers 20" x 26" heavy paperIncluded: Set of 2 Heavy Duty Tuning Fork with Resonance Box and Hammer Sympathetic Tuning Forks 440 Hz. Each of the large Aluminum Alloy tuning forks is hand ground to high accuracy and has a frequency of 440 Hz (hertz=cycles second). Each fork measures 16. 5cm (6. 5") long & is mounted on an individually adjusted resonance box. They have been carefully matched and individually electronically tuned for tonal clarity to their designated or physical