Change every 24 months for best results. Fits product models: Series 9000 (S9xxx), 8000 (S8xxx), Star Wars Shaver SW97xx & SW67xx. The item "Philips Series 9000 Replacement Shaver Shaving Heads and Blades SH90/70" is in sale since Wednesday, October 11, 2017.This item is in the category "Health & Beauty\Shaving & Hair Removal\Electric Shaving & Hair Removal\Electric Shavers\Shaver Accessories". The seller is "melbourneelectronic" and is located in Lynbrook 3975 Victoria. This item can be shipped worldwide.