Material: low carbon steel Coating: zinc-coating or pvc-coated. Gabions are wire mesh boxes, containers or baskets filled with rock to prevent soil erosion and to retain/contain soil particles. They reduce water velocities and re-capture river bed sediment in streams. Flat Gabions, called River or Reno Mattresses are widely used in river courses where soil erosion is a problem over a wide flat area and a large area needs to be protected against soil loss/scour. They are used mostly in the civil engineering industry especially in the construction of roads.