Barnett Crossbow Replacement String. Keep your crossbow ready to fire! When your Barnett crossbow needs repair, put more spring in your shot with Replacement String for a wide array of models! Components do stretch and wear over time, so keeping them "fresh" keep the performance level high. Check them out and pick yours, then order! AVAILABLE SEPARATELY: Barnett Synthetic System String for RC 150, 35"; Barnett Synthetic System String for 300 Mag, 41.13"; Barnett Synthetic System String for Quad 300, 40.38"; Barnett Synthetic System String for Rhino Quad / Rhino Sport Magnum, 38.88"; Barnett Synthetic System String for Rhino / Sport / Rhino Classic, 37"; Barnett Tear Drop Crossbow String for Rhino / Commando II, 20"; Barnett Tear Drop String for RC-150, 16"; Barnett Tear Drop String for RST Super String, 25.63"; Barnett Synthetic System String for Revolution XS; Barnett Synthetic System String for Revolution, 39.625" - word search in our Store for "Barnett". Barnett Synthetic System String for Quad 400, 37"