sano, their throttle is way trick, and it comes in like blue red black and maybe silver, i'm not sure. it's real nice, but fast 50's is what i have with a brake mount and i know they make it w/out the brake mount also. they aren't easy to find, but i will say i had the applied plastic one before and first of all you can't use a big bore kit with that throttle cause the cable has to screw into the throttle and also the part where the cable attaches is really wide and so it's hard to fit your brake lever on your bars.
the applied throttles are great, and like five-0 said they are super smooth. plus they are the cheapest ones out there, like half the price of a billet one. also yes you can use it with a bbk, all you have to do is take the cable out of the cap that it coumes with, and pop it into the carb you need. i have it on my 17mm carb right now.