Miss Mary pressure cooker features an inside-fitting lid. This design is inherently safer than conventional pressure cookers. To open any Miss Mary cooker, you have to first lower the lid slightly into the body of the cooker; and that cannot be done until the steam pressure inside the cooker falls to a safe level. Thus Miss Mary pressure cooker is pressure-locked for safety – like a jetliner door! Each Miss Mary cooker is tested to be leak-proof. Along with a superior pressure regulating system, this ensures that it cooks quickest. Each pressure cooker comes individually packed in an attractive full-colour carton. Cookbooks/Instruction Manuals come free with each pressure cooker. It has ISI mark and is guaranteed for 5 years.