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The original Rock Band guitars didn't have a ring around the Start button, making it very easy to accidentally halt game play by bumping the button. Later version of the guitar came with a ring around that button to prevent this. This model has six small rings that can be super-glued around the start button to provide this benefit.
Because it's such a small piece, I included six of them in the model to split the shipping and handling across a larger number of them.