Now you can cut your own portholes into your own bass drum resonant head. Easily cut 4" & 6" port holes and protect it with Gibraltar's 4" & 6" protector rings (not included).

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Now you can cut your own portholes into your own bass drum resonant head. Easily cut 4" & 6" port holes and protect it with Gibraltar's 4" & 6" protector rings (not included).

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