Amazon.com: SH50/52 Replacement Heads for Philips Norelco Series 5000 Electric Shavers, Compatible with Series 5000 (S5xxx), AquaTouch (AT8xx, AT7xx), PowerTouch (PT8xx, PT7xx), 3 pack : Beauty & Personal Care
SH50/52 Replacement Heads for Philips Norelco Series 5000 Electric Shaver, Replacement Blades Head Fit for Phillips Series 5000 (S5xxx), AquaTouch (S5xxx), PowerTouch (PT8xx, PT7xx), 3-Pack with Brush 3 Pack
User manual Philips AquaTouch S5091 (English - 471 pages)