This work proposes a subwavelength porous meta-liner with broadband sound absorption from 900 to 1. 200 Hz. The meta-liner consists of four subunits. which are made up of porous material and hollow coiling slit embedded in it. https://www.spidertattooz.com/OPI-GelColor-The-Color-That-Keeps-On-Giving-0-5-oz-HPJ07-p22791/