Opa Muurikka Oy is a Finnish manufacturer of Opa, Lumo and Muurikka products. Opa is the oldest saucepan and household utensils manufacturer in Finland and still, after 85 years, provides innovation and functionality for everyday living. MARI - Oven dish range from OPA. MARI is Opa’s new oven dish range for 2015. All around deep black non-stick coating and sturdy steel frame looks good on any table. These dishes are designed to be used from oven to table. Large easy grip handles for added safety. The non-stick coating is designed for everyday use and can be used in temperatures up to 230°C. Mari oven dishes are suitable for all types of cookers and ovens. To preserve the non-stick coating, hand wash is recommended.