Oral-B Clic Ultimate Clean Replacement Brush Heads come as a set of two and are designed to fit exclusively with the Oral-B Clic Handle. These brush heads feature advanced cleaning technologies, including high-tech bristle design and next-generation CrissCross and X-Filament technology for an enhanced brushing experience. They are incompatible with Oral-B rechargeable or battery brushes. Each brush head is manufactured in Germany, ensuring quality and precision in their design.