This product features the Reactive Spring System that is exclusive to Impact Recovery Systems. This unique compression spring assembly offers the strength to support a flexible post or panel. This reactive spring is designed to consistently return the post and panel to its original position, time and time again. Virtually every other flexible traffic control device relies on a flexible plastic for their rebounding mechanism, which softens and wears out over time. The Reactive Spring System will provide performance and durability for years to come! Choose from Left or Right and fixed or quick-release portable base.