Assorted LArge Drilled BAll Set, set of 12, A 3mm hole is drilled through the center of eAch bAll. Every set comes in A convenient plAstic storAge cAse, with A foAm bottom thAt holds eAch bAll firmly in plAce
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