Wax-Core heating technology releases heat slowly and evenly. It helps maintain roller heat while in use providing longer-lasting, soft, shiny curls. Nano Ceramic technology radiates far-infrared heat which is gentler to the hair. Professional Features: 20 velvet-flocked rollers 6 large, 1-1/4 rollers create loose curls & volume 10 medium, 1 rollers create smaller curls and waves 4 small, rollers create tighter curls and ringlets Cool-Touch roller ends for easy handling 20 color-coded metal clips in 3 sizes hold rollers securely in place Locking lid with handle for convenient storage and travel Built-in clip storage compartment with cover – no loose clips! Ready dot changes color once optimal temperature is reached On / off switch with LED ON indicator light One-year warranty