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, 7650,7664,7680,7690,7763,7765,7783,7785,7790, 2,High-Quality Materials: It is made of high-quality materials to achieve continuous, efficient and easy-to-use characteristics. 3,The Best Shaving Effect: In order to the best shaving effect continuously, we recommend that you change the shaving head 18 months. Within 18 months, your electric shaver can trim more than 6 hairs, thereby gradually reducing pruning performance. 4, Processing Technology: The replacement head adopts a processing technology to which more the texture of your shaver. 5, Performance: Changing the head can your shaver's performance and a better shave effect. By changing the head regularly, the shaver will maintain 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 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.