It looks like this Part has been superseded by LEGO Part 12825 Tile Special 1 x 1 with Clip with Rounded Tips.
Click on a colored part below to see the Sets and MOCs that use part 2555 Tile Special 1 x 1 with Clip and Straight Tips in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
This part has been used by MOCs in the following colors but not officially released.