Fripac Self-Grip Rollers 12-pack 21 mm green. The aluminum core of the Fripac self-grip rollers retains heat, allowing hair to dry faster and giving curls more bounce and longer hold. The plastic body for insulation provides stability to the Fripac self-grip rollers and protects against direct contact with the hot aluminum core. A special adhesive tape securely holds the hair in place on the roller, without the need for pins, clips, or rubber bands. Available in various colors and sizes. The bag contains 12 pieces.