Bruce Lee was a big fan of Dumbbells for various forms of training. Here, Bruce is doing some jumping drills (on a trampoline which you can’t see) with some added dumbbell resistance. These dumbbells weight eleven and a half pounds each and Bruce trained with them while he lived in Los Angeles. They aren’t marked but given the location and the style, I’d guess that they were made by the Bell Foundry Co. These dumbbells sold at auction a few years back; the winning bid was over $6000!