Need Help Identifying Cylinders

[grotvik]

https://www.ebay.com/itm/NOS-Mahle-pistons-and-liners-set-for-Porsche-2-4-911S-1972-1973-91110394401/323183007374?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649

The part number on this P/C set indicates the cylinders should be Nikasil. They do not look like nikasil cylinders to me (but I'm not an expert). I contacted the seller but he was unsure if they are nikasil and stated the part number indicated they were.

Thoughts?

Thanks,
Greg

[MBruns]

Those are birel, which is an iron liner that is cast with the aluminum fins, good cyls just an expensive process.
Mike Bruns