Traditional Lamp Cords with Plugs are the traditional white, excellent when used against white or light colored walls. Standard insulated 18 gauge wire has 2 parallel copper wires. The positive/hot is smooth, neutral/negative - has ribs. U.L. Listed for table & floor lamps were cord is exposed. Stripped, copper-tipped ends simplify wrapping wire around socket screws. Molded-on plugs are polarized and permanently attached to lamp cord. SPT-1 rating has traditional plastic insulation, see below.
SPT rating designates insulation thickness: thickness-rating provides varying degrees of resistance to heat and abrasion. Higher SPT rating numbers provide more resistance to abrasion and more protection from electric shock.
Before making any changes to electrical fixtures and/or lamps:
Great product. Installed myself.