Easy to install. Clean the razor before installing. Please make sure of your razor model. Model: 30B Compatible with: New models: 195S, 197S, 199S, 195, 197, 199, FIX400 Old models: 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, 5746 Color: Silver & Black Material: Plastic + Metal Package Contents: 1 x Shaver Head, 1 x Shaver Blade Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the actual item. Measurement may vary by +/- 1-3 cm.