Exfoliation + Cleansing Brush Heads 2 pack: Includes one of each heads for the bt sonic GEN2. The blue head is for Cleansing and is made of proprietary Azul silicone, infused with silver ion for its ultra hygienic benefits. The grey Exfoliation head is also made from proprietary Azul silicone with silver ion but is also infused with corundum. Bio-Therapeutic recommends replacing these heads every 12 months.
