Fiberglass composites are a great material to use in the making of props.  Props made with composites are durable and light weight, allowing for limited amounts of abuse and ease of transport.  Composite swords can easily look like steel, but are easier to transport and less dangerous to handle.

From Youtube MAking Props:

Here is the process I followed to make my kirito’s Elucidator and Dark repulser from Sword art online I wanted to create a light prop that is strong and sturdy enough to not break in the many conventions I visit.