Perfect Egg with colour-changing indicator uses heat to sense cooking times for perfectly cooked soft, medium, and hard-boiled eggs- Made from poly-resin; FDA approved and BPA free; sturdy, durable, and reusable; heat safe to 212F; compact for easy storage- Gradient scale (soft, medium and hard-boiled) cooks single eggs or a dozen with the same perfect texture and yolk consistency; cook time 10-18 minutes- Simply place in the cooking water with eggs; colour heat sensor changes from red to white while eggs cook to clearly indicate how long to boil eggs- Allow to cool completely before handling- Hand wash in warm, soapy water- Dimensions: 2.25 x 1.625 x 1.25-in