These sponged are created from a vegetable fiber that is found naturally. It’s extremely good at absorbing water and causes the sponges to become very soft when soaked in warm water for a couple of minutes. Charcoal Toothpaste, Facial Sponges, Pearl Bar, Bamboo Toothbrush, Konjac, Natural Teeth, Bright Smile, Bamboo Charcoal, Planet Friendly