The United Scientific TFBOX13 tuning fork set includes a mallet and tuning forks with frequencies of 100, 128, 256, 288, 320, 341.3, 384, 426.6, 480, 512, 1,024, 2,048, and 4096Hz for use in science experiments involving sound wave physics. The mallet has one hard end and one soft end for contact with tuning forks, and the set comes in a fitted wooden case. United Scientific Supplies manufactures laboratory supplies and science education products. The company, founded in 1992, is headquartered in Waukegan, IL. WHAT'S IN THE BOX? * Mallet * 100Hz tuning fork * 128Hz tuning fork * 256Hz tuning fork * 288Hz tuning fork * 320Hz tuning fork * 341.3Hz tuning fork * 384Hz tuning fork * 426.6Hz tuning fork * 480Hz tuning fork * 512Hz tuning fork * 1,024Hz tuning fork * 2,048Hz tuning fork * 4096Hz tuning fork * Fitted caseComes in fitted wooden case. Mallet has one hard end and one soft end for contact with tuning forks. Tuning forks with frequencies of 100, 128, 256, 288, 320, 341.3, 384, 426.6, 480, 512, 1,024, 2,048, and 4,096Hz. Tuning forks for use in science experiments involving sound wave physics.Best Sellers Rank: See Top 100 in Industrial & Scientific. : B00ES3INNQ. Manufacturer: United Scientific Supplies. Date First Available: July 5, 2013. Item model number: TFBOX13. Package Dimensions: 17.5 x 11.5 x 2 inches; 2 Pounds. Is Discontinued By Manufacturer: No.