Guar seeds are really hard. Google 'cluster beans' and you might a picture of what they are. Most farmers in the western dry areas grow them. It's a rain fed leguminous crop.
They are about the same size as lead shot.
Usage would depend on the person using it. But by no means is it to be taken lightly!
Justice alone is the mainstay of government and the source of prosperity to the governed, injustice is the most pernicious of things; it saps the foundations of the government and brings ruin upon the realm - Sher Shah Sur, Sultan-ul-Adil.