Disc-shaped troll fishing sinkers. They adjust the depth at which the artificial moves, depending on the speed of the boat, the distance of the artificial, as well as its type, but also the thickness of the thread. They also adjust the distance from the boat to the left or right direction. Their bottom is rotated to adjust, according to the indication they have, the direction of the artificial. The part to which the mother is tied is released during the recovery by taking a horizontal position, so that the navigator does not cause much resistance. They have reinforced parts, such as rings and swivels.