So, a lot of fingerpickers like to use a thumb pick. Now, I don't use one because I just learned without one and so I kind of have a habit and an instinct about where my thumb is supposed to be. But, a lot of players like to use a thumb pick to accentuate those bass notes. Because, remember a lot of this style is kind of having, kind of this bass, this kind of constant bass beat that's going on. And so here's some examples of some different thumb picks. You know, you just, it just kind of slips over your thumb and you kind of just have this little projection that kind of comes out here. So that's one type. This white one is pretty much the same kind of thing. It just has a little bit of a different shape of the actual pick itself. I don't know if you can see this, but the, you know, one of the, here I'll put them both on at the same time. Actually, I'll put it on like that and like that. Of course, you know, you would never play with two thumb picks on at the same time. But this is just kind of to show you, there's kind of a different shape here. So, again, it's just personal preference. This one's kind of more pointed, kind of a shark fin shape. This one's sort of a more of kind of a rounded tip. They even make them kind of like, that basically looks like a flat pick with kind of a thumb loop on it. And that's what kind of this one's like. If you can see that, it's actually kind of shaped like a flat pick with a loop on the back of the thumb. But the idea with a thumb pick is to just, again, kind of accentuate those bass notes. So, if we're doing this finger picking, so it really kind of makes those bass notes pop out. And like I said, I don't practice with these thumb picks that much. Partially because, if you learn without them, then it, you know, in order to have that thumb pick work accurately, you see my thumb has got to be higher, a little higher from the strings, than it would be normally, if I was just playing with my naked, empty thumb. But, again, the idea is to just kind of it brings out those bass notes a little bit better. So the technique is the same, it just, like I say, the only difference is really the, you know, in that case, my thumb is kind of hovering a little bit higher over the strings because it has that little thing sticking out. Whereas, without it, my thumb's, obviously, a lot lower. So, you know, that's a decision you might want to make early on if you're going to use a thumb pick or not. And, you know, just maybe kind of stick with it. If you kind of like a little bit of a punchier sound to those, to that kind of bass progression.