Compatible with: For 5643, 5644, 5645, 5646, 5647, 5649, 5751, 5757, 5758. Compatible with the following models: For 51S and similar models, see description for specific models. Easy to assemble and disassemble: easy replacement without tools. Tip: clean the shaver better before changing the head. It is recommended to replace the shaving heads every 18 months to keep them . Colour: silver Material: plastic + metal Package Contents: 1 * Omentum 1 * Cutter head 1 * Cleaning 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.