Tart rings, typically used in baking, are metal or silicone rings with a diameter of 10 centimeters (about 4 inches). They are designed to create perfectly shaped tart shells or pastry bases for various desserts, such as fruit tarts, quiches, or individual cheesecakes. These rings are usually placed on a baking sheet or tray before filling them with the desired ingredients and baking them in the oven. They help maintain the shape and presentation of the tart during baking and serving. Tart rings are often preferred by pastry chefs for their uniformity and professional appearance.