These dishcloths are made of waved rayon yarn that is infused with binchotan charcoal. Binchotan is the highest grade of charcoal and it works to naturally absorb odor that would typically accumulate within the dishcloth. They feature six layers of material and are available in a large selection of colors. For the colored variations, one side of each cloth features a pigmented color, and the other side is natural, binchotan gray. Care instructions: Please do not use with bleach, or place in the dryer. Initially a bit stiff/crispy, but as you continue to use them, they will get very soft. To speed up the softening process, soak in boiling water a few times.