After some searching the best price / performance ratio. Everywhere they were more expensive. Therefore, I slammed here. These brushes do really, for what they are made. (Read my review on the Philips Visapure at Amazon). The best cleaning result for the brush attachments and conceded, if one uses a Nagelbürstchen to clean. Thus underline under running water gently and without pressure over the brush head. Thus one away any residue and cleaning brushes to be entertained until replacement without dingy!