This product is a lot of 2 Kodak Carousel Tansvue 140 slide trays, designed to hold up to 140 slides each. Manufactured in 1983 in the United States, these slide trays are compatible with Kodak slide projectors and are not modified. They are branded as Kodak and are specifically made for use with Kodak slide projectors, making them a reliable and high-quality option for film photography enthusiasts looking to display their slides.