• Specifically designed to be compatible with Bitvae D2 and Daily D2 electric toothbrushes. • W-shaped bristles that adapt to the shape of the teeth for deep and effective cleaning. • Blue indicator bristles fade after 3 months of use to remind you when it's time to replace. • Each head includes a protective dust cover and is individually sealed to ensure hygiene. • 96% to 99% rounded bristle tips to protect tooth enamel and gums from damage. • The 10-head set provides a long-lasting supply for approximately 2.5 years of use.