In short: Yes, trace amounts of lead are present industry-wide in nearly all electrical cords and wires, including Tru-Tone Classic Light Strings and Mini Lite strings.
Why?
Small amounts of lead are used in the outer PVC layer of electrical cords to keep them flexible and prevent them from cracking over time and exposing the inner current-carrying wires. This is the case for most electrical cords on the market including:
Extension cords
Laptop and phone chargers
Appliance power cords
Should I be concerned?
While the dangers of lead should not be discounted, the amounts found in these products are very small. The lead in electrical cords is integrated into the plastic so it can’t flake or be scratched off, eliminating the primary risk of inhaling or ingesting it. If you are concerned about trace amounts of lead that may be left on your skin, we recommend washing your hands thoroughly after handling electrical cords.
For more reading on this topic, we recommend this excellent article by ChristmasDesigners.com.