YOUSU 3D Printer Filament Bundle, Glow in The Dark Filament Multicolor, Green, Blue, Purple and Rainbow, PLA Filament, Dimensional Accuracy +/-, 250g X 4 Pack
Chinese manufacturer (Guangzhou YOUSU 3D Technology) specialising in co-extrusion silk and multi-colour PLA filaments. Sells on Amazon under the YOUSU brand.