The National Museum of Pakistan description is shown below, although the conical piece in the lower left is a carved shell object and not a weight:
:

"A large number of stone weights have been found in Mohenjodaro, Harappa and other sites in Sind and south Baluchistan which indicate a definite system used uniformly throughout the Indus region. Most of these are carefully cut cubes of banded grey chert, but there are a few of dark grey slate, resembling the barrel shaped weights of Elam and Mesopotamia, and a few other materials, like alabaster, quartzite, jasper, etc.

All the weights are graded accurately in a system unique among ancient civilizations. In lower denominations, the system is binary. 1, 2, 4, 8, 16, 32, on up to 12,800. The traditional ratio 16 9CF 16 S equal to one Rupee is the most 13.6 grams. In the higher weights the system was decimal with fractional weights in thirds. Some extremely small weights were found in a jeweler's shop in Chanhudaro."