They use copper conductors with transparent PVC (polyvinyl chloride) insulation.
Listings show multiple gauges, including 28 AWG, 26 AWG and 18 AWG.
Available lengths include 394.0 inches (about 32.8 ft) and 590.0 inches (about 49.2 ft); one title also lists 49.2 ft.
They are described as rated to withstand 300 V.
Product descriptions list UL2468 certification.
They use transparent PVC insulation described as flame-retardant and wear-resistant.
They’re described as flexible, resistant to kinking, and easy to cut to the desired length for wiring.
Common uses listed include LED lamps and strips, LED light boxes, model and circuit wiring harnesses, small electrical appliances, household wiring, and advertising light panels.