PLA+ 3D Printer Filament Black 250g (0.55bs), Tougher and Stronger, Nealty Wound PLA Plus Filament, Dimensional Accuracy +/-, Fit for Most FDM 3D Printers
Chinese manufacturer (Guangzhou YOUSU 3D Technology) specialising in co-extrusion silk and multi-colour PLA filaments. Sells on Amazon under the YOUSU brand.