Keep a close shave by changing heads every 2 years for the best results your philips shaver has a dual blade system first blade lifts second blade cuts for a comfortable close shave the philips shaver has ultra thin heads with slots to shave long hairs and holes to shave the shortest stubble the skin friendly profile of these philips shaving heads enables smooth skin contact for a comfortable shave change heads every 2 years for the best results super lift amp cut shaving technology with dual