The Surfboards.com split rack pads are 18" long and meant to pad existing crossbars. They come in a pack of two, have ties on each end, and a center velcro strap for extra security. They are made from custom extruded foam and covered in fade-proof acrylic fabric. Available in Regular (for round crossbars), Aero (for flat crossbars), and Extreme (for over-sized crossbars).