New 8-pack or firm bristle tooth brush heads for Oral B model electric toothbrushes. These brush heads are compatible with several models. (8) Replacement Electric Tooth Brush Heads Floss Action Hard Bristles Strong. This model features the strongest firm bristles for ultimate cleaning action. Recommended to replace at least every month. Model as shown in pictures. Compatibility:_x005f_x000D_ Oral b Pro (All Models) 1 600 650 670 680 750 Pro2 2000 2500 2000S 2900 2950N, Pro 3 3000 3500 3900 3900N_x005f_x000D_ Compatible with Pro (All Models) 570 700 1500 1780 2700 5000_x005f_x000D_ Compatible with Pro limited Pro health Pro expert Pro Advantage (All Models)_x005f_x000D_ Compatible with Smart (All Models) 1 1500 4 4000 4000N 4000W/4900N/5 5000/6 6000 6000N/6500/7 7000N SMART CLEAN 360_x005f_x000D_ Compatible with Vitality 100/3D White/Plus/Cross Vitality pro x clean (All Models)_x005f_x000D_ Compatible with Genius X (All Models) 7000 7500 8000 8500N 8900/9000 9900 10000 10000N 10100S /20000 20000N 20900 /4 4000W_x005f_x000D_ Compatible with Genius Limited Edition Aquacare 6 Pro Expert (All Models)_x005f_x000D_ Compatible with Oral b Teen series (All Models)_x005f_x000D_ Compatible with Oral b Junior series (All Models)_x005f_x000D_ Compatible with Oral b kids series (All Models)_x005f_x000D_ Compatible with Oral B Advance Power 100 400 (All Models)_x005f_x000D_ . This model features the strongest firm bristles for ultimate cleaning action. Recommended to replace at least every month. Model as shown in pictures. Compatibility: Oral B Pro Compatible with Pro limited Pro health Pro expert Pro Advantage Compatible with Smart (All Models) Compatible with Vitality 100/3D White/Plus/Cross Vitality pro x clean Compatible with Genius