J-Star is a Taiwan-based designer and manufacturer of carbon fiber composite products, primarily structural components for bicycles and sporting goods rackets. J-Star supplies carbon fiber frames, forks, seat posts, handlebars, cranks, and racket frames to branded sporting goods companies in Europe and Japan, who then sell finished products under their own labels. Key customers include European bicycle brands like Colnago and racket brands like Tecnifibre. J-Star operates on a B2B basis under OEM and ODM models — either manufacturing to customer specifications or co-designing products with customers — earning revenue per unit delivered via purchase orders. J-Star's core differentiation is its proprietary resin formulation technology: rather than using off-the-shelf resin systems, J-Star develops its own resin recipes optimized for specific performance requirements, which it argues produces superior carbon composite products. Manufacturing is outsourced to factories in China, while J-Star retains R&D and quality control in Taiwan. Revenue has declined sharply in recent years, and bicycle parts — historically the dominant segment — have fallen as a share of revenue, with "other products" (auto parts, healthcare equipment, carbon fiber materials) now representing the largest revenue category. J-Star is pursuing several strategic directions to diversify: launching its own e-bike brand, expanding into the U.S. with a planned production facility in Houston, growing into EV and healthcare carbon fiber applications, and distributing solid-state battery technology in the U.S. through an exclusive agreement with PSSB.