These glasses are made from BPA and food grade safe polycarbonate material making them the safest options for outdoor entertaining.You will feel relaxed serving drinks in these glasses while barbequing in your backyard, lounging by the pool, picnicking at the park or camping in the great outdoors due to their superior strength and quality with the guarantee that they will never break, chip or crack. For longer lasting brilliance simply put them in the dishwasher or use a soft cloth with warm soapy water to clean as they may be scratched or damaged if cleaned with abrasive brushes or washed with harsh chemicals.