These Oral B TriZone electric toothbrush heads offer the familiarity of a manual brush in look and usage, with all the efficiency of Oral-Bs power brushing technology. The moving power tip is ideal for hard-to-reach back teeth. The shorter, stationary bristles are perfect for thorough surface cleaning whilst the longer, sweeping bristles will clean between the teeth. Model number: EB30. Pack of 4. Their triple action deep cleaning technology removes significantly more plaque than a regular manual toothbrush (100% more plaque to be specific. ). Compatible with all Oral-B handles except Pulsonic. Manufacturers 2 year guarantee.