The Rock Solid is the effective way to reduce the costly damage that road debris cause to your towed vehicle. Made of durable, all-weather resistant TPR (thermoplastic rubber) material that allows air to flow through the vented flaps, but sturdy enough to stop rocks or small road debris. The two-piece design is fabricated in flexible strips of material attached to a galvanized steel angled channel. The motor home model attaches permanently to the coach (see mounting instructions). Available in two sizes and installs easily onto your RV.