The Speedrite Multi-Fit Rod Post Insulator for 1/4 - 5/8 Rods is a proprietary blend containing microencapsulated probiotics, vitamins, minerals and electrolytes. This supplement blend mixes easily into water for maximum benefit. This livestock supplement introduces beneficial bacteria to the digestive system which helps chicks deal with stress and boost their immune systems. This medicated mixture protects livestock during the most vulnerable time in their lives without the use of antibiotics.