1. Suitable for 3 series 30B: 310,330, 340, 199, 197s-1, 195s-1,199s-1, 4735,4736,4737,4745,4775,4835,4845,4875,4876, 5713,5714,5491, 5492,5493,5494,5743,5745,5742, 7475,7493,7497,7504,7505,7510,7511,7514,7515,7516,7520,7526,7540,7546,7564,7570,7630,7640, 7 650, 7664,7680,7690,7763,7765,7783,7785,7790,2,High-quality materials: It is made of selected high-quality materials to achieve continuous, efficient and easy-to-use characteristics.3,Best shaving effect: To achieve the best shaving effect continuously, we recommend changing the shaving head every 18 months. In 18 months, the electric shaver can trim more than 6 million hairs, gradually reducing the trimming efficiency.4,Special Processing Technology: The replacement head adopts special processing technology to highlight the texture of the shaver more.5,Restore Performance: Changing the head can restore the performance of the shaver and get a better shaving result. By changing the head regularly, your shaver will maintain its best condition for many years. Color: As shown Material: Plastic + Metal Package Contents: 2 x Shaving Accessories Only the above package content, other products are not included. Note: Light shooting and different displays may cause The color of the item in the photo will be a little different from the real one. The measurement error is +/- 1-3cm.