PACKAGE : Contains 6 packs of Osctor replacement tooth brush heads with 6 hygienic caps. HYGIENIC CAPS : Each replacement brush head comes with a hygienically secure cover keeping your bristle free of dust and debris. HIGH QUALITY BRISTLES:Osctor replacement heads are made with end-rounded bristles,blue bristle will fade to let you when a replacement is needed,approximately every 3 months. HIGH COMPATIBILITY: Compatible with Screw-on electric toothbrush handles, including Advance, Essence, Elite, CleanCare,E-series and Xtreme. EXCEPTIONAL CLEAN: Osctor toothbrush replacement heads are designed to fits the natural shape of your teeth for a thorough clean.