Sonic Tractor Beam

A new technological advancement was the Sonic Tractor Beam. A Sonic Tractor Beam can be made from 16mm Transducers, Arduino Nano,  Dual Motor Drive Board, DCtoDC converter,  Lipo Battery (7.3V), 6mm screws and nuts, 300x45x15mm wood piece, 3D Printed Bowl, Small strip board, switch, breadboard buttons,Jumper wires, 12AWG black and red wire. I think that this would be pretty useful for holding multiple light-weight things at one time. A question I have is how much does it cost to make a metallic version of this if this only cost $75?

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