HIGH QUALITY: High quality POM plastic. Fits different types of showers. Make sure your doors slide most comfortably. No inconvenience and no waste of money: you bought a sliding system and it broke You think with horror that now you have to buy a new one. Forget it. Theres a replacement shower door roller that will repair any sliding system in your home for you. If youre having trouble sliding shower doors, use this quick fix and dont waste your money. APPLICATION ANYWHERE: Shower door slides for showers, massage cabins, bathtubs, hot tubs and even for furniture fittings. Make sure that with our slides the door or doors open easily and smoothly. Replace your broken system High quality shower enclosure rollers ROLLER COMPONENT: Smooth door operation, slight forward or backward movement, effortless design of shower stall shower rollers, hydromassage boxes clearly fulfill their assigned task, distribute the mass of the glass, control the movement in the given direction. This gives the product even more durability and a longer life. Steel part of the wheel: 9mm diameter x 3mm height.