Easy to install. Clean the shaver before installing. On average, within 18 months, a shaver will cut approximately 6,000,000 hairs. During this process, the cutting components gradually wear out, which may result in a less comfortable shave. To maintain optimal performance, it is recommended to replace the shaver's foil and cutter block every 18 months for a consistently close and comfortable shave. Compatible with 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 accessories Note: The above package includes only the listed items; other products are not included. Due to lighting and display differences, the actual color may vary slightly from the image. Measurement may vary by +/- 1-3 cm.