Beautiful curls without heat!

So, I found these foam curler rods in the beauty section at winners.
I usually curl my hair three to four times a week with an iron and wanted to give my hair a break from heat. I put these in my hair right after the shower while still wet.. kept them in until it dried and my hair was super curly!!
I've even put them in on straightened hair and it gave me waves with volume!
They were very inexpensive..$5.99 for 12!
I have long thick hair and 12 is enough.