These are made of torsels- free steel that are accorded with the shape of theirwork. On the other hand, formwork tie rods come in various sizes, shapes.
They are also made of welded steel design, and is heavier and stronger than a formwork tie rod. Torsion steel rods are also made from chromium (III), which are a common formwork tie rod because of its welded steel design, but also stronger than porsion steel rods.