Constructed from 18-gauge anodized aluminum, Fat Daddio's 6-Cup Crown Muffin Pan features a rigid rolled rim for durability. Anodizing completely seals the aluminum, making a smooth, scratch-resistant surface, ensuring that there is no cross-contamination or leaching of aluminum into foods. Anodized aluminum is also non-reactive with acidic and dairy ingredients. Fat Daddio's uses an all-natural anodizing process without dyes or nonstick chemicals like PTFE or PTOA.