Features:
100% Brand new and high quality.
Protect your speaker, dustproof, make it cleaner.
Very good impact on the speaker, make the sound quality better.
Easy to install. No instruction included.
Material: rubber
Outside diameter: 300mm +/- 3mm
Inside diameter: 200mm +/- 3mm
Convex outside diameter: 275mm +/- 3mm
Convex inside diameter: 220mm +/- 3mm