Please help with their IDs

[absolute0]

1. Mammillaria schumannii?

https://imgur.com/a/5bPzV

2. Discocactus zehntneri? Coryphantha melleospina?

https://imgur.com/a/jz9ag

3. Another mamm

https://imgur.com/a/u5TGB

4. And another

https://imgur.com/a/3XGRr

5. Faucaria felina? tigrina?

https://imgur.com/a/nyk9Q

I would've wanted to upload the pics directly here but the photos taken from my phone are too large for the forum

[teo]

4 might be M. magnimamma

[ElieEstephane]

1 has a coryphantha feeling to it
4 is mammillaria karwinskiana ssp nejapensis

[stefan m.]

2- i think its some kind of parodia or gymnocalycium.

[jfabiao]

#3 is Mammillaria geminispina.

[absolute0]

1 has a coryphantha feeling to it
4 is mammillaria karwinskiana ssp nejapensis

Thanks! Mammillaria karwinskiana ssp nejapensis is spot on. Would you know which Coryphantha this is? Is it elephantidens? Or hard to tell at this point?

#3 is Mammillaria geminispina.

Thanks! So this is what an older geminispina looks like.

[ElieEstephane]

It's too early to tell maybe give it a year. C. elephantidens is a good bet since they offset at a young age

[7george]

2. Discocactus zehntneri? Coryphantha melleospina?
https://imgur.com/a/jz9ag

Yes, looks like Coryphantha retusa (= Coryphantha melleospina).