These wheels are especially suited for use in wet or potentially corrosive environments. They are a simply designed single piece of thermoplastic polymers which functions well in a wide temperature range of 30 degrees up to 180 degrees Fahrenheit. Po lyolefin is highly resistant to many commonly encountered liquids. Load capacity ranges from about 200 pounds all the way up to 750 pounds depending on wheel size. This wheel is available in seven size options. Order the Polyolefin Wheels for work en vironments that are exposed to liquids and hot and cold temperatures