CompatibleThe cutter head is compatible with SH90 series shavers, S9000 (S9311/27, S9311/84, S9311/87, S9321/88, S9511/63, S9531/84, S9721/84, S9721/87, S9721/89). - No matter which one you use, you can buy it and replace it easilyMaterialStainless steel double-layer blade fits your skin perfectly, works perfectly without hurting your skin, allowing you to have a good experienceNote This product is an integral tool head belt base Assembly. There is no need to replace the blade. Just take the old head down and install the product on it.Usage time and blade sharpness This product adopts a new double-layer stainless steel blade to extend the service life of the blade, it is recommended to replace the new blade within 12 monthsAfter-sales packaging The package contains 1 blade - 1 brush - if you have any questions after receiving the product, please contact us in time, we will give you a satisfactory answer