No, they’re not tiny dumbbells to work out your fingers for better clutch and brake control - they’re axle sliders! Although that isn’t a bad idea now that you mention it… we’ll call them, “thumbbells” (patent pending).
Whether you ride the street or track, you want maximum coverage and minimum chance of your precious motorcycle kissing the pavement. Wheels, rotors, and brake calipers are expensive. Axle sliders are pretty dang affordable. Like a .44 magnum, axle sliders are the type of thing it is much better to have and not need than to need and not have.
Plug your motor scooter info into the handy bike finder up there and see what all front and rear axle sliders RevZilla has for your make and model. From straightforward aluminum to replaceable delrin axle slider pucks, there’s bound to be a nice set of axle sliders for your sport bike or supermoto machine that tickle your fancy. Maybe some fancy CNC milled combination axle block sliders. Now we’re talking.