1930s Box of 5 "JOY" fabric covered long 9" HAIR CURLERS

Original Unused 1930s curlers.
They are 9" long, so 4.5 " when folded in half to be used, made of a very bendy  metal and covered in a soft woven brown fabric.

The instructions, on the side of the box are 
"Place the ends of the hair in the centre and between the folds of the curler then roll up  to the head and bend both ends over "
There are 5 of them in the  box.