Correct, aluminum sometimes used for main house feeds, never interior wiring.
AND, the aluminum must be installed in a specific way, with lubricant at the joints, among other engineering modification on the connectors.
But, I'd wonder about the jumpers - anytime you 'cover' something up and represent it as something it isn't - even on a round about way, as this is, I'd stay away from it personally.
Copper more expensive, probably. Better quality, probably ...
Once again, some seem willing to spend $30-$50k our trucks, another $30-$50k on our RV's (or more) and then scrimp on the support components. Not taking aim at anyone, just noticing it happens.
I'd stay away from this jumper - stay from the 'less quality' -- has any one ever seen an exploding battery? Not a pretty sight, and acid all over. My neighbor cross-connected jumpers on his vehicle once - but he was lucky and didn't get hurt, but that battery sure took a beating - Some places you should not 'save a buck' and electrical systems is one. And the most dangerous -- electricity can kill you, for example, while plumbing can only get you wet (well, unless someone holds your head under)
