If you want the string on your crossbow to last more than 50 shots you must use a rail lubricant, and the Crossbow Rail Lube from Scorpion Venom Archery Lubricants is one of the finest crossbow rail lubricants available. Simply apply a thin bead of this lubricant to the flight rail on your crossbow and you will significantly reduce friction and increase string life. Like all Scorpion Venom Lubricants the Crossbow Rail Lube is 100% odor free and will not break down of stiffen in colder temperatures.