Halcyon Line Arrows are perfect for making lines safe when in an overhead environment. Ensuring that the exit is marked appropriately is vital for the safe exit of a cave system in an emergency. Halcyon Arrows are also great for marking the way back to shot lines, the route around a certain site or the direction of an interesting feature when ocean diving. This is especially true when project diving, the white plastic used to make a Halcyon Line Arrow makes is easy to write on, for example 'bow' could be written on an arrow to allow a diver to orientate themselves with the wreck quickly and with minimal fuss. Halcyon logo embossed in blue.