The blade cover is used to protect softer ingredients, or sous-vide bags, from coming into contact with the moving blades of the mixing knife. This clever accessory covers the blades without preventing stirring, resulting in even heat and gentle cooking. Use the blade cover with the Slow Cook and Sous-vide modes to make the most of the precise temperatures of Thermomix®. The blade cover and peeler does the same, but has also been integrated with a peeler function. With the Peeler, potatoes, carrots and turnips are peeled cleanly and efficiently, leaving no tired hands or mess on the counter. https://www.thermomix.com/products/blade-cover-peeler