I've made jam several times. It's large, so you can boil a large amount of jam at once. Please understand that this is a used item before purchasing. The Mauviel jam ball is a high-quality cooking utensil made of copper, especially ideal for processing fruits such as jams and confitures. Copper has excellent thermal conductivity, transmitting heat evenly and quickly, allowing for even heating of the fruit and optimal temperature control. This prevents burning when making jam and maximizes the flavor and color of the ingredients. Mauviel's jam ball has a wide mouth, making it easy to stir and add fruit, and is designed for easy use in professional and home kitchens. The beautiful luster of copper gives it a luxurious appearance, and it is also very durable, allowing for long-term use. Mauviel is a traditional cookware manufacturer founded in France in 1830, and is trusted by chefs and cooking enthusiasts around the world, especially for its copper products. This jam ball is also a product that combines Mauviel's outstanding craftsmanship and beautiful design, and is a product that combines functionality and beauty.