Mirro 4-quart pressure cooker quickly and healthfully cooks foods with trapped steam at temperatures higher than boiling. It's the ideal size for singles and small families, and makes dishes for three to five people. Pressure cooking requires little water so nutrients, flavor, and color are not boiled away. Made of rust-proof, heavy-gauge aluminum, the cooker has a stay-cool, locking handle. Mirro pressure cookers are designed with safety in mind. This one features the "Triple Safe Design" with a safety release plug, sure-locking lid system, and side gasket pressure release.