Philips Sonicare C1 ProResults (2 x) - buy at Galaxus
C1 Pro Results Sonic Toothbrush Head Replacement Brush Heads Compatible with Philips Sonicare Diamond Clean Electric Toothbrush,HX6014/65,4 Count,White - Walmart.com
Philips Sonicare C1 SimplyClean Value Pack Brush Heads Replacements - Lot of 2
Replacement Toothbrush Heads C1 for Philips Sonicare, HX6014 / 4 Pack, White 797706684596 | eBay