Redmond 4 Medium is a premium sea salt with naturally occurring essential trace minerals including zinc, manganese, copper, iodine and more. 4 Medium Fine—a premium sea salt with naturally occurring essential trace minerals including zinc, manganese, copper, iodine and more. Redmond 4 Medium is free of chemical processing, preferred by livestock, and helps animals maintain a normal function. 4 Medium is the most popular size for sheep operations, but can be used for any large animals. Trace Minerals