Within 18 months, your shaver will cut an average of 6,000,000 hairs. In accomplishing this substantial task, the cutting parts will gradually wear out and your shave may become less close and comfortable. That's why it is recommended to change your shaver's foil and cutter block every 18 months to maintain maximum performance. For an efficient shave every day. Fitment: for Braun Series 3 (320-4, 340 w/d-4, 350-4, 380-4, 390-4) and Triple Action Free Float shavers. Compatible with: Series 3 300s, 310s, 320s, 340S, 350cc, 390CC, 3000BT, 3010s, 3040s, 3050cc, 3070cc, 3080s, & 3090cc Electric Shavers. Shaver head should be replaced every eighteen months. Replacing your razor head helps provide a better shave. For performance, clean regularly. This item is a replacement part. You can renew your old shaver head with this replacement part. Material: Plastic + Metal. Color: Black + Silver. Package Contents: 2 * shaver head, 1 * clean brush. Only the above package content is included; other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.