The product is a lot of 20 Invisalign impression trays specifically designed for the upper teeth. Made by the brand Invisalign, these small trays are intended for use in dental laboratories, endodontics, and dentistry. Manufactured in Mexico, these impression trays are of high quality and provide accurate impressions for creating customized dental appliances. Each tray is a unit and is sold in a quantity of 20, making them ideal for professionals in the dental industry.