Rare old vintage plastic chess pieces.
Not complete. See all the photos.
A kind of weighting agent is a stone with some kind of admixture, possibly sand.

Many chess figures are missing, many chess figures lack weights, there are damages.

Total weight is 400 g.
Weight of the weighted king (black) is 45 g.
Height of the king (black) is 92 mm., base is 35 mm.
Height of the pawn is 45 mm., base is 25 mm.