Anyone familiar with these? I work near a large warehouse complex. There are many commercial vehicles - semi's and buses. When I see these weights on the ground I gather them up with the help of my handy-dandy screwdriver. They are usually stuck to the road near intersections. I think the vehicle hubs heat up when braking, then the adhesive melts and the weights fall off. Then I get 'em.
The bigger ones are 2 ounces each, so that one string is 1/2 lb of lead! The smaller ones are 1 ounce each and they come off bus wheels.
I've been tossing these into my pot. They act like pure lead. Just though I'd post this because I don't remember anyone discussing them.