The innovative Mi Electric Toothbrush head incorporates DuPont™ Tynex® StaClean® Bristles for more comfortable and effective cleaning. The bristles are at a 10-degree angle for 99% removal of plaque and debris. The soft antimicrobial bristles have a copper-free designed to avoid rust and damage to your gums and teeth. The replaceable toothbrush head weighs approximately 7.05g.