Callas Velcro Self Grip Holding Hair Roller 18 pcs. Set has enough quantity to hold your hair for the whole head, even for medium thick, and long hair. Blow dry, roll the ends, leave in while getting ready, and have smooth, curled ends. Make your hair look naturally thick and healthy. The set contains 18 Pcs 2.36" (60mm) Long: 6 large size (diameter 1.57") 6 medium size (diameter 1.18") 6 small size (diameter 0.79")