The Songbird Essentials Hanging Cable Limb Protector 36 in. (SE8036) has a plastic coating around the stainless steel cable that keeps it from damaging your trees. Use it for your feeders or small potted plants that you want to hang on a tree branch. Protect your trees while decorating your garden or backyard. A hanger bird feeder accessory that you might require just to protect and preserve the trees on your house.