Easy to install.Clean the razor before installing.Please make sure well your razor model.Features:Model: 30BCompatible with:New model: 195S,197S,199S,195,197,199,FIX400,Old model: 310,330,340,4735,4736,4737,4747,4775,4835,4845,4875,4876,5491,5492,5493,5494,5495,5713,5714,5715,5716,5742,5743,5745,7475,7493,7497,7504,7505,7510,7511,7514,7515,7516,7520,7526,7540,7546,7564,7570,7630,7640,7650,7664,7680,7690,7763,7765,7783,7785,7790,5746Colour:Silver + blackMaterial:ABS + stainless steelSize:4.2*2.4*2.2cmPackage Contents:2 x Shaver Replacement Foil (The shaver is not included)Only the above package content, other products are not included.Note: Light shooting 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.