Keep a close shave Change heads every 2 years for the best results Every year your blades travel the height of Mt. Everest... 49 times! After such a workout, even the best materials can lose their edge. Retain your shaver"s peak performance - replace heads every 2 years. Compatible with following model shavers: HQ130, HQ132, HQ136, HQ30, HQ33, HQ40, HQ402, HQ404, HQ41, HQ42, HQ441, HQ444, HQ46, HQ460, HQ468, HQ481, HQ489, HQ5824, HQ6415, HQ6423, HQ6445, HQ6605, HQ6610, HQ6613, HQ6646, HQ6675, HQ6676, HQ6695, HQ6696, HQ6831, HQ6842, HQ6843, HQ6844, HQ6857, HQ6859, HQ6863, HQ6874, HQ6879, HQ6900, HQ6920, HQ6940, HQ6941, HQ6950, HQ6970, HQ6990, HQ801, HQ802, HQ805, HQ806, HS190