http://www.heavy-tungsten.com/ - Tungsten alloy disc is made of very dense metal. It is 1.7 times heavier than lead. Only gold, platinum, and a few other rare metals have a similar density.
5.
Fishing sinker
A fishing sinker or plummet is a
weight used to force a lure or bait to
increase its rate of sink, anchoring
ability, and/or casting distance.
The product is made by rare metal – Tungsten, it is an ideal substitute of
the lead fishing sinker. It’s strong adhesive, semisolid state, soft for a long
term. Tungsten Heavy Alloys concentrate maximum weight in the smallest
possible space.