Composite rebars is a construction material that has slowly been gaining traction through its use in infrastructure projects including reservoirs, floors even, highway bridges in the past few years. 
Concrete is brittle and has a low tensile strength and it needs additional reinforcing, commonly steel reinforcement bars, or rebar, are used. However, composite rebar has a number of advantages over steel rebar including durability, cost and maintenance over time. Steel rebars corrode and swell over time resulting in cracking or spalling of the concrete structures.
More info - Coparison propperties, technical and volume
 
NOTE : Prices are per meter and each rod is 5.8m long