Constructed of BCY DynaFlight 97 material, Excalibur Crossbow's Matrix Strings reduces creep while increasing speed. They also feature a proprietary center serving which significantly increases string life. NOTE: Will fit all Matrix and Bulldog series crossbows such as Matrix 405, Matrix 380, Matrix 355, Matrix 310, Grizzly, GRZ2, Bulldog 400, Bulldog 380, Bulldog 440, Bulldog 330
