These duckbill anchors are made of tough, tenzaloy - Kit contains: 3 model 88 Duckbill anchors with 15 feet of cable attached to each anchor with a turnbuckle mid line, 3 tree collars, and 6 cable clamps - Each anchor holds 3,000 pounds in normal soil - Fits tree trunks up to 11 In, diameter - Professional grade SKU: ATF49G88DTS