This is the Plastic Protective cap that covers the foil when the shaver is stored.
Fits Braun FreeControl Shaver Models
Series 1 190, 190s, 190s1, 190s-1, 1775
Type 5729
Fits Braun CruZer2, CruZer3, CruZer4, CruZer6 Face Shaver Models
MG5090, Z30, Z50, Z60, 2775, 2776, 2838, 2864, 2865, 2866, 2874, 2876
Type 5730, 5733, 5729