Replacement Toothbrush HeadsCompatible for Philip Sonicare Electric Brush Head 1100 2100 4100 5100 5300 6100 7500(4A1)

- Provides replacement toothbrush heads, meeting daily replacement needs for electric brushes.? - Compatible with electric brush models 1100, 2100, 4100, 5100, 5300, 6100, 7500.? - Designed for regular use, matching the operation of compatible electric brushes.? - Simple to replace; attach to suitable electric brushes following basic steps.? - Suitable for routine replacement, helping keep electric brushes in good use.?