Economical, approximate masses suitable for elementary studies on the concept of mass. Allows children to weigh objects from 10g to 1990g by 10g division. Supplied inastorage tray and comprising the following stamped masses:
-Steel (hexagonal)1x1kg, 1x500g, 1x200g.
-Brass (cylindrical) 2x100g, 1x50g, 1x20g, 2x10g.