SPIDER Replacement String Crossbow MK-250 2014 or Older Replacement String for Spider Crossbow MK-250 Year 2014 or older This Replacement string can replace the original string of our Spider MK-250 series compound hunting crossbow, including Spider MK-250A1W,MK-250A1B, MK-250A1AC and MK-250A1TC. String length: 17" Contents 1 x Replacement String You might need cable wire to complete the compound system