HIC Kitchen’s Perfect Egg with color-changing indicator uses heat to sense cooking times for perfectly cooked soft, medium, and hard-boiled eggs Made from BPA-free polyresin; sturdy, durable, and reusable; heat safe to 212-degrees Fahrenheit; measures 2.25 x 1.625 x 1.25-inches Gradient scale changes from red to white while eggs cook to indicate perfect soft-boiled, medium-boiled, and hard-boiled eggs; cook time 10-18 minutes Color heat sensor indicates how long to boil eggs for perfectly dippy to hard-boiled; allows consistent yolk texture for single to a dozen eggs Add Perfect Egg in with the cooking water along and eggs before heating the water; allow to cool completely before handling; hand wash