ONLY Fits Pursonic S500/ S520/S522 models ! NOT Fits Pursonic Other models ,Please check the model of your electric toothbrush The densely packed bristles of our replacement brush heads , providing a more thorough and effective clean. Gentle Bristles & Gum Health – toothbrush heads for special contoured soft bristles fit the shape of your teeth. Individually Wrapped & Travel - toothbrush heads replacement for separately sealed and equipped with clear hygienic covers protecting bristles against dust and bacteria for easy storage and travel. 10 Pack replacement toothbrush heads for long-lasting use. ONLY Compatible with Pursonic S500/ S520/S522 models