[Incredible Strong] We use a new formula to improve its rigidity and print performance: 80% nylon coupled with 20% carbon fiber, which is ready to take on your next project. With no less than 20% Nylon based carbon fiber SainSmart CF20 is Easy to print, with great surface finish and strength to take on some of your most demanding jobs. [Lower Shrink Rate] It features with lower shrink rate, higher strength, and rigidity, less warpage and more resistant to wear and tear compared to the traditional nylon filament.