This is a soldering fume replacement media refill for the Quatro Infinity CollectAll and SolderPure dust collectors.  Sold in packages of 5.

The unit has a three-stage filtration system that captures fumes and particulate down to 0.3 Micron. One filter is the easily reclaimed bag filter which captures large particles from grinding and polishing. This is one of the available media/odor filters - this one is specifically for soldering fumes. The third filter is a true HEPA filter which captures the smallest particulate down to subMicron levels. These three types of filters allows you to return 99.97% clean air to your shop, making outside ventilation unnecessary.