This is a completely blank flexible plate for the Prusa MK3 and MK2.5. No surface treatments, no coatings (except for rust prevention), no nothing. Ready for you to apply any surface you want to it. It's a little thinner than the stock plate so it has more flex in it, making it easier to bend to remove your parts. So stock up on these blank plate and get to experimenting with different print surfaces and treatments.