The Consumer Product Safety Association (CPSA) in Japan specializes in the quality control of potentially dangerous consumer goods. Only quality assured products are allowed to bear the SG Mark, which meet the Japanese government standards in line with Consumer Product Safety Law. Unlike other quality assurance stickers found on Shinai, the SG Mark is not awarded from a collective group of Kendogu manufacturers and retailers, rather it is a government approved seal that ensures products have met strict legal quality standards.
As well as on Shinai, the SG Mark can be found on various products which have the potential to endanger human life - including bicycles, baby carriers, motorcycle helmets, climbing equipment and much more. For official information (PDF) about the SG Mark and the CPSA click here.