Dock Edge Life RingLife Rings DOLPHIN Life Rings are manufactured in North America with U. S. Coast Guard, Canadian Coast Guard and DOT approval. All Dolphin Life Rings are rigorously tested and monitored by the Underwriters Laboratories of the United States and Canada. The ring bodies are warranted for seven years under all climatic conditions and are resistant to fire, oil, and gas. The hard shell prevents tearing and ripping and is virtually vandal proof. The design