8.66" x 7.95" (22cm x 20.2cm) Holographic Green Mechbox Switch Sticker.

The switch is green with a blue stem. The product image includes the "rainbow" affect made by the holographic finish. 

In the photos I have compared it to the size of a switch, and to the size of the two other stickers I sell in this design. You will of course just receive the 8.7" sticker (the largest one).