We have 40 balusters for sale. They are SOLID wrought iron and all are 36" long and are 1/2" square. Twenty one have the "bulb" feature in the middle and nineteen have the straight /spiraled design (see photos). The color is a dark brown (oil-rubbed bronze maybe?) but they can be painted as needed.
We also have nine shorter ones that are 28.5" long. These were used on the angled part of the stairway railing (not shown in pics).
These would be a great way to upgrade from wooden balusters. BTW there are some helpful clips on YouTube for how to create square holes in wood. And, if needed, you can find shoes/boots to cover the ends online.
This offer does not include the posts or wooden top/handrail.