Tungsten Alloy Weighted Ball Monkey First

Tungsten alloy weighted ball monkey first is a knot added to the end of a light-line or heaving line. This knot usually incorporates a small stone or similar weight, to allow the end of the line to travel farther when being thrown. When approaching a jetty or another vessel, sailors will throw a heaving line, to establish a link with the shore or other boat. The heaving line can be easily thrown a distance of 20 m (60 feet) or more. One end of the heaving line is then secured to a heavier line, or hawser, which is pulled across and used for towing or securing.

For more details, you could find tungsten alloy weight.