Lenovo Flex 14" Slot-In Sleeve, Black (GX40H55184) Dedicated port openings allow you to use all of your connected devices with the covering in place. Form-fitting sleeve ensures a precise fit for your Flex 3/4 2-in-1s Protect your Flex 3 or Flex 4 Multi-Mode notebook in all of it's modes. Flex 3/4 14" Slot-In Sleeve (Black)