 Dermal meaning skin, denticles meaning teeth. So they actually have little tiny teeth all over their skin. So it makes their skin really rough. There's actually like indigenous communities that used to actually use their skin as sandpaper and for all sorts of things like that. So yeah, it's really neat because if you rub them from their snout to their tail, it's very smooth because that's the direction that they swim in. And so their dermal denticles all lay down in one direction and