Compatible electric shaver replacement head. Compatible models: 70-B1000s, 70-B1200s, 70-N1000S, 70-N1200S, 70-N4300cs, 70-S1000s, 70-S1200s, 70-S4200cs, 70-57200cc, 70-S7865cc shavers. Made of stainless steel. The blades are very sharp. Under normal use, the outer blade should be replaced approximately every 1 year, and the inner blade approximately every 2 years. We recommend replacing them within these periods to maintain a comfortable shave. Product Description: We offer a 6-month replacement warranty, so you can purchase with confidence. Shaver blades are consumables. With daily use, small nicks and unevenness can occur on the mesh, gradually reducing the sharpness. Package Contents: 1 x Outer Blade + Inner Blade. Note: This is a replacement product, so please refrain from mixing it with the original product!!!!