If you are ordering custom made replacement slings for your patio sling chairs and chaises, you DO NOT NEED TO ORDER sling rod or spline in addition to your new patio slings. New plastic sling rod is included with your new replacement slings custom. All replacement slings come with the medium diameter (7/32”) sling rod. If you require a different diameter or you are sewing your own replacement slings, you can order replacement plastic sling rod in this section. Sling rod is sold by the foot.