For horses who are not receiving a balanced concentrate feed, the highly palatable Purina(R) Free Balance(R) 12: 12 Vitamin & Mineral Supplement provides the added vitamins and minerals needed to balance a pasture or hay-only diet. Purina(R) Free Balance(R) 12: 12 is also available in a 25 pound bag. Vitamin & Mineral Fortification - To support strong bones, immune system and reproductive functionWeather Resistant - Granular Technology Delivery System helps prevent product from absorbing water or blowing out of the feederVitamin Stability for BioavailabilityAdded Antioxidants Including Vitamin E - Added amino acids help promote muscle growth & healthy hair coat, skin and hoovesNatural Flavoring that Horses Love | Purina Free Balance 12:12 Vitamin & Mineral Equine Supplement Block | Size 40 lb