Stainless steel. According to the query of Keep official website, the jade laurel dog ring in the spring activity of Keep is made of stainless steel, and there is a spring tea party running activity in keep. You can get a cinnamon roll ring after completing the challenge. Keep was launched on February 4, 20 15, and is committed to providing one-stop sports solutions for fitness teaching, running, cycling, making friends, diet guidance and equipment purchase.