Fit for below electric toothbrush handles:*Professional Care: 500, 550, 1000, 3000, 2000, 600 , one thousand ,3250, 5000, 5500, 6000, 6500, 7400, 7500, 7550, 7850, 7875, 8000, 8300, 8500, 8850, 8860, 8875, 8900, 8950, 3-d Excel, Plak Control 3D*Triumph Professional Care: 9000, 9100, 9400, 9425, 9450, 9475, 9500, 9900, 9910, 9930, 9950*Trizone: 600,1000,3000,5000*Triumph: 5000 wi-fi SmartGuide, 4000, Triumph 5000 inkl. Smart Guide*Smart Series: 4000, 4750, 5000, SmartSeries 4000 , SmartSeries 5000 with SmartGuide