The Masontops Complete Mason Jar DIY Fermentation Kit Wide Mouth is a comprehensive kit that includes 15 items, such as a lid, recipe book, and silicone stopper. Made of wood, glass, and silicone materials, this multicolored kit from the trusted brand Masontops is perfect for home fermentation projects. With a wide mouth size and a weight of 4 lbs, this unit offers everything you need to get started on your fermentation journey.