Plasticality shower stools are made of sturdy polypropylene. They provide the congruence of lightweight design with sturdiness, longevity, and carefree use. These shower stools are made of sturdy inert poypropylene which are resistant to all commonly used shower and soaps used in the shower and bathroom. They will not stain or deteriorate over time. You will appreciate that they will look as great over time as they do the day you take them out of the box.