3D Printer Carbon Fiber Filament: PolyLite PLA-CF is a carbon-fiber reinforced PLA filament that offers high strength and rigidity while maintaining good toughness. It also features an impressive satin and matte finish, resulting in smooth-looking prints. Tangle-Free & Moisture-Proof: Meticulously wound to prevent tangling, the filament is dried and vacuum-sealed in a resealable zip lock bag with desiccant. Important: Always hold onto the tip of the filament to avoid knots. Use the holes on the spool to prevent this issue.