Mermaid Professional Seamless Aluminium Muffin/Crumpet Rings set of 4 3.3inches Diameter x 0.8 inches Hygenic Seamless design Ideal for Muffins, Crumpets, Burger Press, Frying Eggs and Much more Freezer and Oven safe up to 475 Deg C. Full Instructions and Recipe for Crumpets on reverse. Hand Wash Only