Centaur Eco Pure Loose Ring Jointed MouthWe love this Centaur Eco Pure Loose Ring Jointed Mouth bit because of the durable material and design. Safe for Your Horse & Mother Nature. A Refined Thinner Mouth Better Strength and Abrasion Resistance Environmentally Friendly Engineered with Materials that pass REACHs Strict Standards Sizes: 4" 4. 25" 4. 5" 5" 5. 25" 5. 5" **Due to the contagious nature of the equine disease EHV 1, and per biosecurity measure guidelines suggested by the American