The product is a lot of 4 Argus No. 593 Automatic Slide Changer Magazines and a lit of 3 Airequipt magazines. These slide magazines are specifically designed for use with slide projectors and are compatible with various brands, such as Airequipt and universal brands. The magazines are essential for those who enjoy film photography and looking to showcase their slides in a seamless and automatic manner. This lot offers the opportunity to have multiple magazines on hand for continuous use with a slide projector.