Help Identifying the exact species of Leather

[Spbk84]

Hello Everyone,

I visited a local Aquarium shop and they were selling this Red Sea 650s along with the Livestock for over $8k lol. I asked for a frag of this leather but they wouldn't part with one. Would you please identify the type of Finger leather this is?

 

[scchase]

Sinularia flexibilis 100%

 

[Spbk84]

Thank You!!