Original Replacement Tooth Brush Heads for Xiaomi Mijia T301/ T302 Sonic Electric Toothbrush Spare Heads Rust-free, metal-free bristles four lightweight brush head Tooth-shaped gum-protecting brush variety DuPont self-cleaning smooth wool Compatible products: Mijia Sonic Electric Toothbrush T301/T302 Copper-free bristle brush head, no rust stains, safe to use. Using copper-free bristle technology, no metal rust stains are produced, and the growth of oral bacteria is reduced. 4 lightweight brush head The brush head is slender, which improves the ability transmission performance from the motor to the brush head; It feels so tender and thin, more appropriate for hand-holding. Increase the amount of hair by way of about 40%*, and clear tooth extra efficiently. The Mijia sonic electric toothbrush adopts a brand new high-density hair transplanting process, which might develop the quantity of hair through about 40% in comparison with standard round hole hair transplanting, and clean enamel more efficiently.