Safely use these balls in food and pharmaceutical environments to clean screens in vibrating sifters or to act as a seal in pumps and check valves. They're polyurethane with metal and chemical additives, which means they absorb shock and resist abrasion like rubber and are strong like plastic but also include additives that make them detectable on hygienic lines. These additives will set off metal detectors, X-ray machines, and magnetic traps if these balls fall into food. This helps you comply with Hazard Analysis and Critical Control Point (HACCP) programs. These balls do not contain BPA or plasticizers, so they won’t cause contamination or impart tastes or odors to products. They are FDA compliant for direct contact with food.