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Jiayouy 4" Bass Drum Adjustable Port Hole Rings Drumhead Sound Enhancer for Bass Drum Percussion Accessories Solid Hardwood : Amazon.ca: Musical Instruments, Stage & Studio
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My new favorite kick reso mod - Calftone/Fiberskyn style head with these wood porthole rings. Link to products in comments. : r/drums
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Amazon.com: TUOREN Bass Drum Port Hole Protector Ring for Enhances sound and Resonant Bass Drumhead - Foam Cushion (Red) : Musical Instruments
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Ahead Bass Drum O's HC-6 6inch Hole Bass Drum Port Ring – Chrome - Buy Online at Mega Music Australia
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