The oral b pack of 8 precision clean brush head bristles reach deep between teeth and cover more surface leaving your whole mouth cleaner than a regular manual and power away up to 100 more plaque for a superior clean vs a regular manual toothbrush the oral b pack of 8 precision clean brush heads in this refill pack are compatible with oral b genius 8000 9000 compatible with oral b pro 600 650 1000 2000 2500 3000 4000 4900 5000 6000 6500 7000 compatible with all oral b vitality a