Located in Iwakuni, Yamaguchi, Japan, Sunline is a fishing line manufacturer established in 1977. Sunline produces all types of fishing line for every type of target and method from freshwater to saltwater. Materials include nylon, fluorocarbon, ultra high molecular weight polyethylene, polyester (polyethylene terephthalate), and metal.

The fundamental concept at Sunline has always been to develop a thinner, stronger fishing line. The company is constantly challenging itself to give full play to its original technology in the creation of new products.