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Cool White LED Ring Light PCB - 70mm Diameter - 5V Power : ID 5138 : $8.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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2mm X 70mm (NBR) Buna-N 70 Duro Metric O-Ring [N2.00X070] : The O-Ring Store LLC, We make getting O-Rings easy!
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