The 2 pack Petkit Eversweet Travel Carbon Replacement Filtration units are only to be used with the Eversweet Travel device The filtration units are composed of natural coconut shells The filtration unit helps filter out Heavy Metals and Chlorine found in contaminated or unfiltered water Internally each filter features mesh screens with activated carbon and Ion Exchange Resins Each Carbon filter is to be used for 100 bottles 200 bottle supply per pack Features . Eversweet Travel 2 Pack Replacement Filters. 200 Bottle Re Fills Specifications . Color Black. Size One Size. Dimension in L x W x H L 2 8 in x W 2 8 in x H 3 2 in . Weight 0 07 lbs