I have 3, obviously unused, Philips Sonicare toothbrush heads. We switched to a cheaper electric toothbrush a little prematurely, and realized we stranded these guys. They're too expensive for me to throw away in good conscience, so please take them from me. They are like these, https://www.amazon.com/Philips-Sonicare-replacement-toothbrush-HX7022/dp/B00... We bought a 6 pack from Costco back in the day. -- Grace P. Ferguson, MD MPH