These things work quite fine - they cover the resonance hole on the guitar so that nothing can fall in. normally these things are used to avoid feedbacks with the interrior microphone of the guitar on high volumes (on stage for example).
[FONT=Times New Roman]Holiness is in right action and courage on behalf of those who cannot defend themselves. What you decide to do every day makes you a good person... or not.[/FONT][br][br]