They look like the FX hybrids.
Those slugs are in the PB $ range per round.
Looks like a great option, but even at 1,500 slugs in 25 cal they are $0.12/each before shipping. NSA and Apolo slugs are much more affordable and so far very accurate. However, they are significantly less than the identical FX slugs.
I have no idea what their performance is like. It appears they are being made with or solely from reclaimed core lead from jacketed PB bullets that rates a 10 on the Brinellhardness scale,