Mazda BT-50 2011-2020 Parabolic Leaf Spring - Terrain TamerThis is for 1 x parabolic leaf spring. If you require a pair, please select 2 under quantity and add to cart. Terrain Tamer Parabolic Leaf Springs are designed for the ultimate ride quality. Traditional 4WD leaf springs are often thick, heavy, uncomfortable and loud, offering little to no flex. In response to this Terrain Tamer developed their 4WD Parabolic Leaf Springs, applying a carefully researched design and modern technology to a well