The best way of pinning the mainline down flush on the bottom next to your rig. helping to camouflage your set up from wary fish. * Super-dense Tungsten compound is much heavier than standard sinking rig tubes ensuring it sinks quickly without the need for using additional weights or tungsten putty to pin it down. * Ultra soft and supple ?bottom-hugging? formula genuinely follows the contours of the lake or river bed to aid better presentation. * Uniform diameter bore makes it easier to thread the mainline. When you are threading the line, it is easier if the tube and line are dry. * 2 metres per packet. * Low-viz camo colours available in Green, Brown & Grey to match the rest of the Covert range, suiting many different lake or river beds.