MDF Wheel, 6mm thick fibre board, 34mm and come with drilled centre holes for 4mm dowel, There are also available in 54mm and 74mm or you can order a mix bag
Doppler Effect Demonstration Apparatus, 92dB buzzer, 0.8m tether. Nylon cord is 2ft 8in attached to a rugged ABS handle 8.5in long, (1in diameter), Swing the apparatus and students will be able to hear the change in frequency, Dimensions: 4.5 x 5 x 3 in
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