Note: The image shows the plastic 1-sided die inked in black. Yours will likely need to be inked once it is received.
This is a genuine 1-sided die, the legendary d1. Every gamer needs 1-sided dice in their collection, to determine the outcome when there is only one option. Before one-sided dice the closest gamers could come was a d4, and then you had to roll the d4 over and over until you got a result of a one. Now with 1-sided dice there is an easy solution: one roll will quickly and efficiently let you know the result when there's only one possible option! This d1 is about twice the size of standard dice. This plastic d1 is very light-weight without a lot of heft to it (it's lighter than a standard die, despite being much larger, and the more costly metal version feels much better).
The Awesome Dice 1-sided die is in fact a möbius strip: an object with only one side. If you put your finger on any point on the dice and trace it along the surface, you'll eventually come back to your starting point and you will have touched every surface of the die.
You can roll the 1-sided die by spinning it like a coin. The one-sided die has the number 1 on the surface twice on the same side (get it - because there's only one side!) and the numbers come uninked. You can ink the number with any fine-tipped permanent marker; however, since there's only one side a cunning gamer can usually predict the outcome without seeing the numbers.