What it is:

From the Team that made the amazing Nevermore filters, they now bring you high-quality sourced Carbon. This carbon is made using a special process that yields a higher quality product specifically for Air Filtration lasting up to 2x longer than traditional carbon pellets and capturing more VOC with improved filtration area. 

Package allows for 
Standard: 5x V5 duo refills / 10x V4 refills, or 750ml / 25oz

X-Large:  3x the Standard size (in volume not weight)