Wise rock guitar players protect their hearing and their valuable earplugs can now be conveniently kept on the guitar itself. This small holder fits most guitars on the back of the headstock so the plugs are always clean and ready. It will not interfere with your playing and the guitar still fits into its case as usual with the plugs stored inside.
I recommend the expensive high fidelity hearing protectors. Cheap foam ones are shown here.
Black colour will blend with most paint schemes but costs a bit more, you will need a bit of double-face tape to secure it to the guitar.