This Baseline Nerve/Sensory Tuning Fork set is the industry standard tool for evaluating hearing and vibratory sensation. Includes 2 Nerve/Sensory Evaluators Tuning Forks Clinical Grade 30 and 256 cps Tuning Fork features: o Non-magnetic, corrosion resistant aluminum alloy construction o Weights 1/3 of a comparable steel tuning fork o Produced from a 3/8" x 1" bar stock for superior performance and consistent frequency o Extra long 2" handle of turned smooth aluminum facilitates bone conduction tests