Willard Ropes Treated Poly Calf Rope- SilverWillard Ropes Treated Poly Calf Rope Silver 4 Strand More Weight Smoother Feel Far less Stretch than 3 Strand Right Hand Only Color: Silver Strike them in sliver. The four strand construction gives the rope more weight and a much smoother feel. They have far less stretch than our three strand polys, which all calf ropers love to use in the arena! Treated Only.