Metal Wire Triangular is made by winding metal wires, and its shape is similar to that of a spring. It is also known as triangular elastic packing and belongs to Fenske Spiral packing. The difference between it and a bullet is that each circle it wraps around is not a circle but a triangle, and the triangles between circles are offset by a certain angle. Therefore, from the end face direction, it is a polygonal shape, which has higher filling efficiency.