This is a stunt taser used in the scene between Josh Lucas and Eric Bana, Josh is trying to provoke Bruce into becoming the hulk. I've included a screen cap for reference, but the HERO prop with lights is most prominently seen. The scene involves multiple zaps where the taser can't even be seen, so I imagine it was used in footage that was not used/exists out of sight.
The taser is made of foam and probably PVC pipe, cast rubber parts with metallic paints. Around 3 ft long, probably weighs a pound.
