Easy to install. Clean the razor before installing. On average, a Braun shaver will cut approximately 6,000,000 hairs within 18 months. During this time, the cutting parts will gradually wear out, which may result in a less close and comfortable shave. It is recommended to replace the shaver's foil and cutter block every 18 months to maintain optimal performance for a perfect shave every day. Suitable for 5 series models: wfs1, wfs2, 530, 550, 590, 8585, 8985, 8995, 8975, 5643, 5645, 5646, 5647, 5649, 5751, ContourPro550, ContourPro560, ContourPro570CC, ContourPro590CC. Color: as shown. Material: stainless steel. Package Contents: 1 x shaving accessory. Only the above package content is included; other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.