This is a rare Kickport FX-2BD bass drum enhancer. These don’t come up on eBay often. Akin to the more common front Kickport, it attaches to the batter bass drum head and creates a small port that fattens the sound - optimising low-end frequencies. I’ve included in the pictures the AI overview and the blurb directly from Kickport’s own website. Unopened extra pack of replacement self-adhesive rings included. These are very difficult to get hold of. The port alone is £25+ online, so grab a bargain.
