Since the turn of the century, these hollow glass floats, woven into the rope line of large fishing nets, were the worldwide choice of commercial fishermen from Norway to Japan to America. Often these round glass renegades escaped their worn-out nets. With the advent of plastic and the decline in commercial fishing, these lost, blue/green glass floats are now rare and highly sought after by collectors around the world. They were made by fusing glass together, so each ball has seams. Since age and origin is difficult to determine, variances may occur with each.