Excalibur Excel Crossbow String - 36in - The Excel Crossbow String is machine made to achieve high arrow velocities with maximum reliability. This string will fit all older Exo series crossbow models with magtip limbs such as Equinox, Exomax, Phoenix, Vortex, Axiom SMF, Ibex SMF, Vixen, Exocet, and Eclipse. NOTE: Not to be used for the Matrix, Micro, Bulldog, or DualFire series crossbows.