Amazon.com : Toothbrush Replacement Heads Compatible with Philips Sonicare, Medium to Soft Electric Brush Head Refills for Sonic Care DiamondClean C1 C2 C3 G2 G3 W2 W3 4100 5100 6100 etc, 8
Philips Sonicare G2 Optimal Gum Health Care Replacement Toothbrush Heads, HX9033/65, White 3-pk - Walmart.com