Original Replacement Tooth Brush Heads for Xiaomi Mijia T301/ T302 Sonic Electric Toothbrush Spare Heads Rust-free, metal-free bristles four light-weight brush head Tooth-shaped gum-protecting brush kind DuPont self-cleaning pleased wool Compatible products: Mijia Sonic Electric Toothbrush T301/T302 Copper-free bristle brush head, no rust stains, secure to use. Using copper-free bristle technology, no metallic rust stains are produced, and the expansion of oral bacteria is reduced. 4 lightweight brush head The brush head is slender, which improves the power transmission performance from the motor to the comb head; It feels so gentle and thin, more suitable for hand-holding. Increase the quantity of hair by means of about 40%*, and clean teeth more efficiently. The Mijia sonic electric toothbrush adopts a brand new high-density hair transplanting process, which might broaden the quantity of hair via manner of about 40% compared to typical round gap hair transplanting, and clean enamel more efficiently.