This set features Oral-B Pro Cross Action Black Refill brush heads, designed for a superior clean. The unique CrossAction bristles surround each tooth to remove up to 100% more plaque than a regular manual toothbrush. Ideal for maintaining optimal oral hygiene, these refills ensure you always have a fresh, effective brushing experience. They are compatible with most Oral-B rechargeable electric toothbrushes and are perfect for deep cleaning hard-to-reach areas.