These Philips Sonicare W2 Optimal White replacement brush heads are designed for adults seeking a brighter smile. Each pack contains four white oval-shaped heads featuring soft bristles that gently clean teeth while remaining kind to the gums. They are fully compatible with the HX9054/87 handle, which operates at a rotation speed of 31,000 oscillations per minute and a pulse frequency of 48,000 pulses per minute to effectively remove plaque. This system is powered by a battery that lasts up to eight days on a single four-hour charge, providing roughly 32 minutes of brushing time.