The ″ Wide Boat Lift Sling is made from marine grade polyester. The polyester helps reduce stretching. The slings feature an exclusive permanent yellow color die process. This process, developed for the boat lift industry, guarantees the color will not come off the sling. UV Protected Marine Grade Polyester 8000 lb. Basket Rating Designed for Lifting Boats Galvanized Pear Rings w/ Sheaf Guards Double Padded Keel Pad Sewn in Lead Weights