Thank you for providing your feedback. Proposition 65 is a mandated warning for all products that are sold in California. Nowhere are we stating that these products are not safe or that these products possess any health concerns, but are simply providing a warning to comply with the California state regulations. Styrene is commonly used among a wide variety of consumer products used every day that are made of plastics and rubber. Consumer products containing styrene include: packaging materials, insulation for electrical uses (i.e., wiring and appliances), insulation for homes and other buildings, fiberglass, plastic pipes, automobile parts and drinking cups and other "food-use" items. In fact, Styrene has been successfully used for decades in the plumbing industry. Home Depot offers information on Prop 65 underneath the product description in the product bullets. You can also visit the official Prop 65 page. We hope this will clarify things for you.