Stable hybrids from nirvana

Hi.
Somebody tell me,what strains from nirvana shop is stable.
Do Ak-48,Northern lights,chrystal,Ice,Jock Horror,short rider,swiss cheese is stable or F1 hybrids??

if it's any help i know aurora indica is an F1

I grew out WW,WR,AI and AK-48. I didn't get a good read on the ak, only one out of ten was female...the buds look great though and the sample was great.
The other three I'd say were spot on, I could tell the difference between each strain and each strain having very little variation. You'll get a decent phenom out of ten seeds....you'll get even better phenoms out of 100 seeds, the more the merrier...
I had 8 wws, 6 ais, 7wrs, that turned female so I had quite a selection to chose from, intending to keep only the very best of each one. I chose ww#6, AI#2 and #4, and WR#7. They were the very best of a good crop. Hope that helps.

If you're looking to breed skip the hybrids and head straight to the IBL lines. If you're just looking for seedstock that has limited variation in phenos, then I think Seasmoke's recommendations should get you going. I hear good things about Nirvana's Big Bud fyi.