Easy to install. Clean the before installing. Please make sure well your model. Description: Model: 424 Type: Shaver Foil / Shaver Foil+Cutter Head Compatible with: Compatible with 424 series models: Micrometre 3550CC 424 285 3000 series screen foil to fit System 1, 2, 3. Fits electric shaver models 3010, 3012, 3025, 3500, 3510, 3512, 3525, 3550, 5419, 5424, 5469, 5470, 5479, 5564, 5567, 5569, 5579 3550CC 424 285 Material:Plastic + Metal colour:Black + Silver Package Contents: 1 x Shaver Replacement Foil 1 x Cutter Head Only the above package content, other products are not included. Note: Light 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.