100% Natural. The sponge is made of vegetable fibers, from Konjac (Konnyaku) plant root. This super-soft bathing sponge presents a safer and more eco-friendly alternative to the traditional PVC sponges. The unique net like structure of the sponge, gently massages and cleansing your face and body. Free of any chemicals, additives and preservatives, the konjac sponge will not cause any allergic reactions, and helps balance out the pH value of the skin. This sponge is ideal cleansing for everyone. Please note the sponges are dry with a shelf life of 3 years (unopened)compared to wet sponges with 1 year only.