Water Rings were metallic counters that represented the volume of water released by a body of a dead Fremen processed through a deathstill. They were manufactured in denominations ranging from 50 liters to 1/32 of a drachm (a drachm being 1/150 of a liter). The water was stored in the sietch holding basin, but possession of the rings gave permission to draw upon it at need, or bestow it upon needier members of the tribe. Following the death of their owner, water rings were returned to the tribal store, or, if worn by a woman, remained with her until her death.