These lick tubs contain Redmond sea salt and Redmond conditioner to help keep the rumen ph balanced, binds toxins, and help with fiber digestion. Plus paired with the Probiotein prebiotics that feed the gut microbes to maximize feed utilization they are one of the best lick tubs for livestock gut health. They are also in a biodegradable cardboard tub so no need to worry about tub deposits or having to round them up to bring them back.