the 510 pin fell out when i took it out of the packaging and the coils arent even close to 1 ohm like they say thats if you can get them to work as the chimney peice will end up causing a short even if you get them as close as the posts as you can. if i were asked if they were any good i would say buy the real thing and don`t bother with this one it shit and should be taken off here and never be put back on again