Within 18 months, your shaver cut an average of 6,000,000 hairs. In accomplishing this substantial task, the cutting parts gradually wear out and your shave may become less close and comfortable. That's why recommends changing your shaver's foil and cutter block every 18 months to maintain your shaver's maximum performance. For an efficient shave every day. Fitment: for Series 3 (320-4, 340 w/d-4, 350-4, 380-4, 390-4) and Triple Action FreeFloat 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 head gives a 25% better shave. For performance; clean regularly. This item is an economical afforable replacement part. you can renew your old shaver head with such good price replacement part Colour:Black+silver Material:Plastic + Metal Package Contents: 5 * Shaver Head 5 * Clean Brush Only the above package content, other products are not included. Note: Light reflection 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.