YOUSU Silk Shiny 4 Types Rainbow Multi Colored Fast Color Change PLA 4 in 1 3D Printer Filament Bundle: 4 Types Multi Colored Silk PLA, 250g/Spool, 4 Spools 3D Printing Filament
Chinese manufacturer (Guangzhou YOUSU 3D Technology) specialising in co-extrusion silk and multi-colour PLA filaments. Sells on Amazon under the YOUSU brand.