Deep-Cut River strip
These terrain strips are manufactured by Deep-Cut Studio in Lithuania. They are printed on a mouse-mat material and are made from cloth, impregnated with paint, on a 2mm thick rubber foam backing. They are 9cm (4.5") wide and 183 cm (6 feet) long. The set also includes 360 degrees of bends, which can be cut to different angles.
They can be rolled up and quickly laid flat over the gaming surface. They can be cut with scissors or a craft knife.