Idk, but I went through 3 sets, and they went blown, I had a carbon hood and they would not hold it up... I posted videos on here before... But ya, it annoyed me so I gave up with ngr and got some prosport ones, they look actually better IMO also. But to each their own, ngr is china stuff, mist of had a bad batch I guess... Thts why my job never buys anything from china, cause their inspection sucks.