Nikken Kogaku 

Headquartered in Tokyo, Japan, Nikken Kogaku Co., Ltd., established in 1950, specializes in the production and sale of wave-attenuating blocks across Japan. Their product line features blocks engineered for wave dissipation, coastal revetment, and general shoreline defense. They further offer specific blocks aimed at riverbank disaster mitigation and environmental preservation. In addition to these, the company supplies natural stone materials and various geosynthetic products. Their clientele spans a wide array of sectors, including infrastructure, transportation, tourism, civil engineering, governmental bodies, and construction consulting firms.