This patented supersonic brush has a hard inner core and evenly-spaced soft bristles to deliver 8X the volume. This clump-free mascara glides on evenly from root to tip for big, smooth, and even eyelashes. Ophthalmologist tested. Suitable for sensitive eyes and contact lens wearers. This patented supersonic brush has a hard inner core and evenly-spaced soft bristles to deliver 8x the volume Clump-free mascara glides on evenly from root to tip Washable formula