It is recommended that you replace your shaving head once every 12 months for maximum shaving performance.Compatible with HQ8 series for PHILIPS norelco shavers.Fit for PHILIPS and Norelco models / types: 71 -Series, 72 -Series, 73 -Series, 77 -Series, 7800, 88 -Series, PT / AT7--Series, PT / AT8-Series,SH50/52,etc.This a Generic High quality replacement for a fraction of the price brand new and good quality.1. These universal heads are compatible with the following for PHILIPS models:AT810, AT815, AT830, AT890, PT710, PT715, PT720, PT730, PT735X, 7737X, 7745X, 7775X, HQ7740, HQ7742, HQ7760, HQ7762, HQ7780, HQ7782, HQ7782, HQ7782, HQ7780, HQ7782, HQ7782, HQ778110XL, 8831XL, 8845XL, 8846XL, 8865XL, 8887XL, 8880XL, 8881XL, 8883XL, 8890XL, 8891XL, 8892XL, 8894XL, 8895XL, 7800XL, 7800XL, 7812XL, 7350XL, 7345XL, 7340XL, 107350XL, 107350XL, 10XL, 7350XL, 7350XLHQ7890, HQ8894, HQ8890, HQ8885, HQ8882, HQ8880, HQ8875, HQ8870, HQ8865, HQ8845, HQ8845, HQ8830, HQ8825, HQ8445, HQ7800, HQ7380, HQ736300, HQ73200, HQ7360, HQ7360, HQ7360, HQ7360, HQ7360 HQ7360, HQ7100, HQ7100, HQ7360, HQ7100, HQ7100, HQ7300, HQ7360, HQ7100, HQ7360, HQ7100, HQ7360, HQ7360, HQ73, HQ7100, HQ7360, HQ7200, HQ7360, HQ7Q, HQ73, HQ73, HQ73colour:SilverMaterial:metalPackage Contents:3 x Cutter head accessoriesOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.