Each spiral perm rod measures approx. 15.5 cm/ 6.1 inch in length, the diameter measures approx. 0.6 cm/ 0.24 inch, proper size for your daily use, can give your hair the right curl. These hairdressing spiral hair perm rods are made of plastic, no harm on your hair, suitable for most type of hairstyle, you can apply them at home, also convenient for you to use outdoors. the hair curlers can be used without any electric, heat wand and perm cream required, youhairstylesafeandcomfortable, no damage to hair. sufficient quantity can satisfy your daily needs, you also can share with your friends, families or other people.very suitable for home,hotel,andanybeautyplaces.With a large quantity, it is applicable for hair salon. 46 pieces spiral perm bars in 4 different colors include pink, green, yellow, purple.