Nesco Snackmaster Add-A-Trays expand the capacity of your favorite Nesco dehydrator. These trays work specifically with Nesco 20 and 30 Series Dehydrators that expand up to a maximum of 7 trays. Each tray is made of high-quality, BPA-free, food grade plastic and is designed to increase the drying ability of the dehydrator. Our patented Converga-Flow drying system provides proper heat distribution that dehydrates foods faster and more evenly from top to bottom, with no tray rotation necessary. Nesco Snackmaster Add-A-Trays enable you to take advantage of your dehydrator by increasing the overall drying area. Expand your dehydrator with additional trays as your needs grow, perfect for drying more of your favorite meats with our famous jerky seasonings. With additional trays, you can save time by drying larger batches. Drying efficiency is not altered by the addition of extra trays. Compatible with 13 diameter trays. Hand wash only.