Imagine being able to quickly create a head full of soft waves, body, cascading curls, or spiraling ringlets. Calista Ion Hot Rollers are designed to do just that, giving your hair body, wave, or curl in less time with less effort. Calista uses Ion technology to ensure gorgeous style. And for even more convenience, this set includes a larger, customer-requested base that holds all 12 rollers at once!These state-of-the-art curl rollers have the PTC heating element in the roller itself, allowing the rollers to heat quickly and stay hot longer. Also, Ion technology infuses multi-element mineral powders into each roller when it is cast.