Easy to install. Clean the razor before installing.Compatible With Series: 360 Completely,8000 Series,Activator,Series 5 Shavers,ContourPro Model NO :8970, 8975, 8985, 8986, 8987, 8990, 8991, 8995,8595, 8795, 8581, 8583, 8585, 8588, 8590, 8781, 8783, 8790, WF1s, 510, 550, 560, 570cc, 590cc 530s-4, 550, 550s-3, 550s-4, 550cc-4, 560, 560s-3, 560s-4, 565cc-4,570cc, 570cc-3, 570cc-4, 590cc, 590cc-3, 590cc-4, 8385 C&R,8374, 8377 - Series 5, ContourPro Type: 5643, 5644, 5645, 5646, 5647, 5649, 5751, 5757, 5758 and etc.Please make sure well your razor model.Model Number: For 51B SeriesNotes: It can be compatible with other models.Please con sult us when you have problems before buying.Product Type: Electric Shaver PartsMaterial: ABS+Stainless SteelModel: 51BSize:2.5*4.3*2.2cmColor: BlackPackage Contents:1 * Shaver Replacement Blade Foil HeadOnly 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.