The Flatout Suspension Rear Overload Spring is built for the 2010-2025 Subaru Outback and is designed for rigs that carry constant weight such as rooftop tents, rear tire carriers, drawer systems, or towing loads. This linear rate spring uses ASTM A1000 Grade A SiCr steel with a 330lb/in rate, about 25% over stock, to reduce sag and prevent bottoming out when loaded while staying close to stock ride height once weight is added. It is designed to add load capacity without adding lift. Sold as a pair, made in the USA, and backed by a lifetime warranty against sag and deformation. Canada-wide shipping from Flat 4 Offroad in Calgary.