First i thought they might not be ... after applying heat to the sides of it,they become strong enough and rough edges have gone. u can make more then 3 bangles using one plastic bottle (may be more depending on the width ). Thanks for Watching :
by Cosmopolitan.com
by Anybody can make
by Kanha sevak
by Bridget H
by Beadaholique
by Polly's origami
by expertvillage