Long ago when I was a child, I remember those days women where using hair curling rollers at home. It also was quite usual to see them on the street, for some reason this was not done anymore. In Cuba I saw them again on the street from time to time.
I did some Google based research and found out how rollers are looking today. They today are made out of plastic I found out, there are all kind of variants. The ones here probably are from cardboard or PVC electricity pipes. I am sure they work very well!