The unique line biter is designed to be attached to your main line between the rod tip and the water and will exadurate any tiny indication, ensuring that you don't miss a thing. You don't realise how much you're alarms and indicators are missing until you use one of these. They attach to the line via a clip, the same as a back lead does, they're hi-viz with glow-in-the-dark tape around the neck so you can keep an eye on what's occring even at night, and they float but are slightly weighted so they sit upright in the water. These are also invaluable for giving you a visual indication of where your lines are when returning to your swim in a boat, allowing you to easily see and avoid your main lines and avoid any potential disasters. 1 per pack.