Braun 5646761 - Consider changing every 18 months Series: Series 5, 360 ° Complete, ContourPro, Activator Model: 8595, 8795, 8588, 8590, 8790, 8581, 8583, 8585, 8781, 8783, 8785, 8995, 590cc , 550, 8975, 8990, 8991, 540, 570cc, 8970, 8985, 8986, 8987, 8915, 510, 550, 560, 570cc, 590cc, 8385 CR, 8374, 8377, 510 Type: 5643, 5644, 5645, 5646 , 5647, 5649, 5652, 5751, 5757