they're most likely blitzluft, herion, KIP, etc etc, theyre all the same they have a logo on the solenoid that looks like it says "CSA
" or some shit... i have them and i've been real unhappy with them.one of my rear inflates sticks, has stuck since brand new, and one of the front deflates wouldnt hold pressure either, brand new first time i tried it, so i just replaced it with another one i got locally. i wanna switch to smc's