Our polystyrene line arrows are available in white, black or glow-in-the-dark and are { 2 3/8 in | 6 cm } long.

Two adjacent arrows facing away from each other mark a point in the cave where the diver is equidistant from two exits. Two adjacent line arrows may also mark a "jump" location in a cave when they are placed pointing toward each other; although a better method is to use a non-directional 'Line Cookie'.