One strong possibility is that they are curtain or drapery weights. These were attached to fabric to help curtains hang evenly and stay in place, especially in larger or more formal homes where appearance and symmetry mattered.
Another explanation is that they could be clock weights. Traditional mechanical clocks used suspended metal weights that slowly descended to power internal gears, keeping time and driving chimes without electricity or batteries.
They might also be window sash weights, hidden inside walls in older buildings. These were connected to pulleys and cords to balance heavy wooden windows, allowing them to open and close smoothly without effort.
To identify them more precisely, factors like exact weight, size, surface markings, and whether there are numbers or symbols are important. Finding many identical pieces together usually suggests they belonged to a shared mechanical system.
Rather than being thrown away, objects like these often turn out to be remnants of older technology. What seems mysterious today may once have been a simple, functional part of everyday household life, now preserved as a quiet piece of history.