4 pcs (1x4) E-Cron® brush. Philips Sonicare ProResults Mini Replacement. Fully compatible with the following models of Philips electric toothbrush: DiamondClean, FlexCare, FlexCare Platinum, FlexCare (+), HealthyWhite, 2 Series, Easy Clean and PowerUp.
The E-Cron brush perfect match to my Philips Sonicare ultrasound handset - just as good as the original, only significantly cheaper.