Braun - This blade and head replacement is compatible with all Braun Series X beard trimmer and electric razor hybrids. Features one blade with four cutting elementsconsisting of two side trimmers and two central shaving zones. Specialized 4D-Blade technology delivers an easy and comfortable shave that is gentle on skin. Fully waterproof and made from 100% stainless steel, the blade is built to last.it cuts consistently for up to 6 months**Based on 2x full shaves per week, actual results may vary.