I believe there are 24 of these in one pack at $10. I found these at Kmart since Walmart only has a limited selection.
These have a sponge in the middle and wires inside the cloth. Definitely sleepable but it would take some getting used to.
I am starting to get into heatless styles that way I won't do more damage to my hair than i've done already. (since i plan on coloring it again lol) If I use a good amount of these in my hair I get almost a fro like style. lol but it was cool to see how it would look like. I sleep with these in and I don't mind it. It makes me getting ready in the mornings so much faster, just unroll, fix my bangs..hairspray and i'm off to start a good hair day! haha