An impact-resistant polycarbonate sheet was ordered from McMaster-Carr. It is a 24 inch by 24 inch sheet that is 0.04 inch thick.  It is clear, with "good" tensile strength and "excellent" impact strength. Both sides of the sheet will be smooth.  It was $13.66.
A 25 pack of 3/8 inch diameter ball bearings were ordered off amazon.com from BC Trade, LLC.  They are made of a steel alloy. They have a smooth finish. It was $8.21.

TOTAL SPENT SO FAR: $11.80


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