Bio Ionic iTools Silver Classic Series Brush Large Round ibrush Hybrid Bristle Large Round With patented Natural Ion Complex molded right into their heat resistant bristles, Bio Ionic Smoothing Brushes provide natural ion therapy with every stroke. Product Features: Lightweight. Minimizes breakage and split ends. Adds luster, shine, and manageability to your hair. Removes build-up. Ionic construction: To control fly-aways and static electricity. Ergonomic handles. Designed for use with Bio Ionic Ion-Conditioning Dryers to achieve maximum results.