I had a set of these fitted to my fazer and they were great. not noticeable either aside from the extra wires if you’re going for a stealth sort of thing.
Quality!
So what do you do, just wrap them around the bar metal and then slip your standard grips over the top?
wrap the heat shield around your bar on the left and around your throttle body on the right, then wrap the element around that (you need to do these as tightly as possible) then slide your standard grip back on.
keep an eye on where the cables route when you slick the element on, and buy a relay to make the heater switch off when the ignition is off too.
Very interesting… Think I’ll give it a go. How did the cables tidy up once the grips went back on?
I’ve got a spare controller and can easily rig up a relay…
Might be worth making a tutorial with piccies for some of us less savvy folks! 
:Whistling:
Given that I have muffs on, these are the perfect solution, rather than spending £30 on R&G ones or £70 on the oxford ones! 
Is that your way of preventing carb icing?
I’ve still not experienced this carb icing thing!
but no, it’s to stop it melting your plastic throttle body.
Throttle tube to be precise
a guide based on how I did it. connect the heating elements to your battery terminals first to check they work!
the physical bit:
step 1. take off your bar ends.
step 2. tape off your grips. they’ll be stuck to the bar so this is tricky. best way I’ve found is to gently prise a blunt tool like a tent peg between the grip and bar and wriggle it. work it round the grip, maybe using something to loosen the glue and lube the probe (ooer). I found WD40 worked well here.
step 3. clean the bar and the inside of the grip with a solvent, I used carb cleaner cos I had it hanging around.
step 4. slice along the length of the heat shield and cut it to correct diameter for each grip so there’s no overlap.
step 5. glue the inside of the heat shield to the bar, I used hairspray as it goes on wet but dries sticky. I then used electrical tape to seal the ends down while it dried properly.
step 6. Position the heating elements on top of the heat shield making sure that if it doesn’t go all the way round, the gap is where your wrist will be. also pay attention to the wires and where they’ll be coming out. I prefer mine on the back of the bar where they’re not seen. Also bear in mind the element will move with the throttle grip so the wire may rub against the throttle cable housing.
step 7. stick the elements to the heat shield and leave to make sure they’re secure. again I used some electrical tape to stop the edges from peeling away.
step 8. Slide the grip back onto the bar. this is difficult because you now have the extra thickness of the heater to fit in it. I used hairspray again to assist in lubing the grip as it went on and for it to stick again once dry. if you’re doing this in the cold, you might need some sort of heat gun to warm the hairspray up so it dries.
step 9. re-attach the bar ends.
the electrical bit
This is based somewhat on your skills. solder any connections where possible and tape/heatshrink/weatherproof any connections that might get wet. some extension of wires might be necessary.
step 1. you’ll have a pair of wires from each grip. twist the red pair together and the black pair together so you only have 2 wires to connect to the battery.
step 2. decide where you want the switch to be. I cut a small hole hole in my side fairing and put a waterproof switch in there (not like the one it came with).
step 3. connect the red wire from the bars to the positive battery terminal.
step 4. connect the black wire from the bars to the switch. make sure you use the correct switch terminal (there should be 3, you only need 2).
step 5. connect the other connecting terminal on the switch to the negative terminal of the battery. when you flick the switch on, the grips should feel warm to the touch within a minute or so.
Don’t forget to switch off the grips when you turn the ignition off or you’ll flatten your battery.
If you’re feeling fancy then fit a relay to the wire from the battery to the switch so that the heated grips only come on when the ignition is on.
Err, isn’t that “heat shield” actually heat shrink tubing?
Yeah that’s just heat shrink but it will do the insulation bit all the same. I doubt they’ll get hot enough to melt the plastic on a throttle tube
I’ve ordered some so will take a couple snaps when I get them sorted. Cheers Groovy
Oh this looks like my first job for the New Year, nice and easy solution