What is copper clad aluminum? Is it copper or aluminum??

Most of the answers already posted to this question, have clearly pointed out that important differences between copper clad aluminum (CCA) and pure copper conductors. Especially the highly detailed answer by “The Undisclosed”. These jumper cables are designed for designed for automotive applications. However, there’s another point to consider when comparing the benefits of 100% copper over aluminum and all other variations. The electrical wiring used in the construction of the houses we live in is the most important from a safety standpoint and is also another good example of the difference in electrical conductors. The cost of producing copper reached an outrageously high amount during the seventies. It suddenly became one of the most expensive materials used in the construction of new residential and commercial building projects. Aluminum wiring became an inexpensive alternative to the much higher priced copper wiring and was used extensively in new construction. Everything seemed fine UNTIL relatively new homes started burning down. The cause of these fires was quickly linked to the all aluminum wiring being used. The reason why has already been explained in the other answers but in a nutshell, the aluminum wiring is such a poor conductor of electrical current that anywhere the aluminum conductors were cut and spliced or connected to a switch or outlet, extra measures had to be taken to ensure the connection point was tightly secured. If the electrical bonding point was loose then it would become a point of high electrical resistance resulting in a dangerous increase in temperature at that point. High enough to cause combustion with any flammable materials in the immediate vicinity. The problem was quickly dealt with by the construction industry banning the use of all aluminum wiring. Copper clad aluminum or CCA became an acceptable compromise for wiring in most types of new construction. It’s the process of coating aluminum conductors with a thin layer of copper to improve its ability to conduct electricity. It costs considerably less than pure copper and with projects that require hundreds or even thousands of feet of wiring, it can substantially reduce the overall cost. But knowing the technical differences between the two, I prefer 100% copper regardless of the price.

Are they made in USA?

Box says "made in China". Works great on my '62 Caddy my '09 VW Tiguan and my '99 Camry. I figured they must be good for American, German and Japanese cars.

Manufacturer	Energizer
Brand	Energizer
Model	ENB220
Package Dimensions	38.28 x 34.7 x 9.19 cm; 3.4 kg
Item model number	ENB220
Is Discontinued By Manufacturer	No
Special Features	もつれなし。, ヘビーデューティー, 全天候型。, 柔軟。
Item Weight	3.4 Kilograms

Energizer ジャンパーケーブル カーバッテリー用 高耐久 自動車ブースターケーブル バッテリー上がり、バッテリー低下時のジャンプスタート用 - キャリーバッグ付属(6m(20フィート)2ゲージ)

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Energizer ジャンパーケーブルカーバッテリー用高耐久自動車ブースターケーブルバッテリー上がり、バッテリー低下時のジャンプスタート用 - キャリーバッグ付属(6m(20フィート)2ゲージ)