Two bottles that have a nylon string through them. The string can be tightened using a tuning peg.The bottles are held in place with two aluminum clamps. The whole apparatus is placed on a flexible ply board. The bottles amplify the sound made by the string so in effect they are the sound boxes.
The wooden tuning peg tightens the string to change the pitch and the pitch can be further modified by pressing the string (between the peg and the bottle) down on the board at different points.
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