• PLA Pro filament is a strengthening version of PLA filament with many superior features. • With an upgraded formula, PLA Pro filaments are tangle-free, clog-free, and bubble-free compared to regular PLA filaments. • It ensures seamless PLA 3D printing with a smooth surface, less tangle, no jamming, no warping while keeping the machine running consistently. • Add one color to cart and don't pay. Then add second color and repeat. After all colors added in the cart, go to cart and make total payment for all, discount will apply. Note: Color box or Generic box sent randomly. • This is PLA Pro/PLA+, for more colors, see our self-developed colorful 3D printer filaments. Flashforge Self-developed 3D FilamentsExtrude Smoothly. Designed and manufactured with clog-free patent to ensure a smooth and stable printing experience with these filament refills.Tangle-Free. Full mechanical winding and strict manual examination, to make sure the line tidy and less-tangle, so as to avoid possible line breaking.±0.02mm Precision. The whole manufacturing process is closely monitored and tested - we ensure ±0.02mm precision and highly-consistent colors.No Irritating Odor. Harmless to human body, very light smell.Dry for 24 Hours. Complete drying for 24 hours before packaging and vacuum sealed with desiccants in a transparent bag.