Norm,
Those appear to be a Fiamm Auto Horn replacement (probably high/low note setup). You can find them at any automotive store.
After a long blow of those horns...Numbnuts will not be referring to the person you are blowing the horn at...but yourself.
Joe
Having had 'em on my bike in that position for a few years now, I can say, it's really not as loud as you'd think from the rider's position... It's noticeable, by all means, but not painful for the rider, and they do tend to get attention of the wandering cage operator on their precious cell phone...
Joe nailed the type and purchase location, and Serk is right about them not being painful. In fact I decided they weren't painful enough and added two additional horns under the swing arm.
My wife says I'm just plain .....Horny......
