Screen captures courtesy of Earth62.net
Above is a an up close look at one of the fan pins prominently seen in the final episode of Sliders, "The Seer." As you can see from the screen capture, the pin is one of the larger sized types (measuring approximately six inches in diameter). And just to note...you will notice the pin says "The Sliders." This was the title of the series on Seer earth...with the inclusion of "The" showing that while similar to the show we watch, there were very noted and sometimes subtle differences.