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OOK 25 ft. 35 lb. 18-Gauge Copper Hobby Wire 50161 - The Home Depot

Pyramid 4-Gauge Clear Black Ground Wire - 25 Ft. 4 AWG Gauge, Economy Oxygen-Free Copper Cable Wire w/ Flexible & Bendable Jacket, Translucent Matte Insulator, Chemical & Heat-Resistant RPB425 : Everything