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. Thats why recommends changing your shavers foil and cutter block every 18 months to maintain your shavers 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 Free Float shavers.Compatible with: for Series 3 300s, 310s, 320s, 340S, 350cc, 390CC, 3000BT, 3010s, 3040s, 3050cc, 3070cc, 3080s, & 3090cc Electric ShaversShaver 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 partMaterial:Plastic + Metalcolour:Black + SilverPackage Contents:2 * shaver head1 * clean brushOnly 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.