Please note that this item does not come with a case to reduce shipping costs. The desiccant packs are made of sterile non-woven fabric, silica gel, deoxidizer, and activated carbon, effectively preventing moisture and mold in pet food. These desiccant packs keep cat and dog food dry and fresh, improving your pet's health and enjoyment. They measure 3.14 x 3.14 x 0.35 inches and fit most automatic feeders. They can be used without interfering with the feeder's function by placing the pet food drying box under the lid. Compatible with Petlibro automatic cat feeder models PLAF001, PLAF002, PLAF101, PLAF005, PLAF006, PLAF103, and PLAF203, and also suitable for similar devices from other brands.