Samsung French door refrigerator doors have an issue where sometimes the mullion doesn't close properly due to the left door being misaligned too low. This shim is a $0.02 replacement for the $12 OEM part.
Video describing problem and solution: https://www.youtube.com/watch?v=1j8h9S0QBBY
Four thicknesses are available: 1mm, 1.5mm, 2mm, and 2.5mm.
The author hasn't provided the model origin yet.