Easy to install. Clean the before installing. Please make sure well your model. Compatible with:For all 31S models including: Old 3 series: 350 360 370 380 390cc 5000series 6000series 5000 5315 5414 5415 5416 5417 5418 5427 5441 5443 5444 5446 5455 5476 5478 5483 5484 5497 5504 5505 5515 5520 5610 561 5612 5613 5663 5736 5738 5739 5770 5771 5773 5774 5776 5790 5873 5874 5875 5876 5877 5884 5887 5888 5895 5897 6410 6515 6518 6520 6521 6550 Colour:silver Material:ABS+stainless steel Package Contents: 1 x Replacement Shaver foil 1 x Shave Cutter Blade 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.