Parallel (Flat) Cloth Covered Lamp Cord. Order by the foot or 100-foot spools. Most of our vintage style flat cords are SPT-1. If you need SPT-2 cords please contact us. The difference between the two is the thickness of the insulation around the copper wire. SPT-1 insulation thickness is 0.30", and SPT-2 wire is 0.45"