For Sale: 25 Foot roll of 1/4 Inch Vinyl Sling Spline. <br><br> This is used to repair outdoor patio sling furniture, Awning spline and also slide out covers on RVs. <br><br> The spline is designed to fit into the seam of fabric and then slid into a rail on a chair frame. <br><br>Our vinyl, solid spline is extruded for outdoor use, it is commercial quality 100% virgin solid vinyl with ultra violet inhibitors manufactured into the product.