plastic. fit different kinds of showers. Ensure your doors the most comfortable glideNO DISCOMPORT & NO WASTE OF MONEY: Did you buy a sliding system and it broke? You think with horror that now need to buy a new. Forget about it! There is replacement shower door roller which will fix for you any sliding system in your home. If you are having trouble with sliding the shower doors, use this quick fix and do not waste your moneyAPPLICATION ANYWHERE: Shower Door Runners for showers massage cabins, bathtubs, whirlpool and even for furniture fittings. Make sure with our runners the door or the doors slide open easily and smoothly. Replace your broken system high quality Shower Enclosure RollersBEARING COMPONENT: Smooth running of the door slight movement forward or back design effortlessly shower rollers for shower cabins, hydromassage boxes clearly perform the task assigned to themSteel part of the wheel: 19mm diameter x 5mm height, distribute the mass of the glass, control the movement in the given direction. This gives the product even more durability and longer service life