These Bullet Weights Rubber Grip lead sinkers have a rubber core and two tabs on each end of the sinker. The line is placed in the sinker's groove, and then the tabs are twisted in opposite directions, wrapping the line around the rubber core. When the tabs are twisted in reverse, the line is released. Rubber Grip sinkers have many applications, but most importantly, Rubber Grip sinkers can quickly be added or removed without nicking or otherwise degrading you fishing line.