Concrete
By adding a small addition of polymer (plastic) the concrete becomes elastic and pliable. It´s is not so soft that it can be bent, it’s still a stone material but has a pleasant feeling to it - warm, smooth and comfortable. The products are molded by hand in a small foundry outside of Stockholm. The concrete is cast of a relatively viscous mass that causes the surface to receive a varying smoothness and color variations occurs, this contributes to the vibrant impression.
Best way to clean is with detergent, a soft dish brush in horsehair and tepid water then wipe with a dish towel.
Note that you cannot fill the concrete cup with water and cleaning detergent and have the brush standing in it. Use the brush with toilet cleaners, clean the toilet, shake out excessive water and place the brush in the concrete cup.