i buy fake green ones, i think they're the pfizer ones, at least the break into 3 pieces with the middle piece being bigger. i know they are fake for reasons i'm not gonna talk about here. anyway, the ones i get are strong as fuck. i got no other xanax i was able to compare these too just pharmacy grade klonopin. i've been wondering the same thing if it's a different benzo in there. i was ensured it's aprazolam. either way seems like it wears off real quick and started giving me night sweats/waking me with withdrawal symptoms about 12 hours after a dose.