Innovative PLA Production Technology - SUMLAND UV filament, using an innovative core-wrapping process, with an outer layer of clear PLA wrapped around a blue-black glittery inner core, to maximize the light emitting time. Simply expose the filament to UV light for a few minutes, you will get an amazing glow-in-the-dark effect. Amazing product experienced! Glittering Starry Sky-Shine the UV light on the filament as if you are in a glittering starry sky. When the light fades, the Starry Night filament appears clear and black with glitter. But when the light is sustained, the filament glows in the dark like a blue starry sky, perfect for printing decorations for the holidays. Smooth Printing Superior Quality- PLA filament No clogs,No bubbles,No tangles. Diameter of 1.75mm with a precision tolerance of +/- 0.02mm ensures smooth and high quality 3D prints.Exceptional toughness ensures stable and uninterrupted printing, delivering superior quality results. Wide Compatibil