Crossbow maintenance is an important part of being a responsible crossbow hunter. Barnett recommends lubricating the rail/flight track with rail lube and string with lube wax every 5-10 shots, and adding wax to the cables as necessary. This Rail & Lubewax Combo includes everything you need to do just that. Often forgotten, but an essential step in keeping your crossbow at its best, these crossbow accessories are a must!