Prevent your dishwasher trolleys from getting stuck or sliding out of the guides, which can cause damage to your dishes and accidents. In just 5 minutes, you'll be able to slide the trolleys in and out with ease. This kit includes all the wheels on the bottom tray of your Bosch, Neff, Balay, or Siemens dishwasher. Installation is very simple; no tools are required. Simply insert the center of the wheel into the axle and press gently until you hear a click. It is considered a plastic and recommended for contact with food and for kitchen utensils due to its safety. It does not contain BPA (bisphenol A) or phthalates