With a wider 4” mouth, allows easier access for cleaning, made from heavy P.E.T. food grade plastic. The Carboys do not use plasticize material and are made with 100% Virgin material of Food grade materials and is BPA free. Comes with an O-ring and air-tight ONE PIECE lid with a hole that will take our #10 stopper. There are no ribs, only smooth sides, so no yeast or sediment will adhere to walls during fermentation. Solid lid is available as an option (not included in the product sold as a separate item) so you can customize your lid (drill as many holes as you wish). Completely taste and odour-free. It is also stain resistant. Impermeable to oxygen. 100% made in Canada. Comes with 5-Gallon, 6-Gallon and 7-Gallon easy-to-read markings on the side. Also they are big enough so you can use them as your Primary Fermentor.