This 31 in. Anneau Sling from Petzel is a climbing essential. It is made of 100% polyester, weighs 2.8 oz., and boasts a strength of 22kN. 100% Polyester. 31 in. long. Weighs 2.8 oz.. Strength: 22 kN. Imported. | Petzl Anneau 31-Inch Sling