One thing to watch. Check whether there is a quality system certification; whether the certificate of conformity is standardized; whether there is the factory name, factory address, inspection seal, production date; whether there are trademarks, specifications, voltage, etc. printed on the wires. Also look at the cross-section of the copper core of the wire. High-quality copper is bright and soft in color, otherwise it is a defective product.

Second, try. You can take a piece of wire and bend it repeatedly by hand. Any wire that feels soft to the touch, has good fatigue resistance, has high plastic or rubber feel and has no cracks on the wire insulation is a high-quality product.

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