Washbeautyco. konjac sponges are 100% all-natural cleansing sponges made from a konjac potato or konnyaku, which is a root plant native to Asia. Used in Korea, Japan and China for over 1,500 years, the konjac root is highly praised for its many uses including medicine, diet food and in beauty products. The konjac root is very rich in minerals and has natural cleansing properties. It is naturally alkaline meaning it is pH neutral, leaving your skin perfectly cleansed and balanced.