Glow in Dark Luminous Multicolor Fast Color Change Rainbow PLA Filament:  Around Each 5-10 Meters to Change Colors: To Get Amazing Luminous Effect, Pls Expose the Finished Printed Item to Short-Wave Visible Light (<450nm), Bright Sunlight, or Ultraviolet (UV) Light for Around 20-30 Minutes; Recommend Light Sources: Direct Sunlight and UV Light | High Quality and Strong Compatibility: 1.75mm Diameter, High Quality Controlled, We Use the Premium Quality Raw Material to Keep Longer Time Luminous Effect; In Order to Keep Better Luminous Effect, It's Not Suggest to Exposure Filament at Sunlight at Long Time. Perfectly Compatible with Most of the FDM 3D Printers and 3D Pens in Market, Such as Creality Ender, ANYCUBIC, Flashforge, Monoprice, SCRIB3D, MYNT3D, Melt Well and Feed Smoothly, No bubble, No Jamming, No Warping, Easy to Print | 100% Tangle-Free Tips and Printing Setting: All of Our Filament are 100% Tangle-Free before Package Opened, Pls Kindly Fix Filament End after Each Time Printing, Pls Make Sure to Insert Free End of Filament into Spool Holes, to Avoid Being Tangled for Next Time Use; To Improve Printing Quality, Pls Use New 0.4mm+ 3D Printer Nozzle | Package: Each Spool Filament Net Weight is 1KG, Vacuum Packaging with Dryers to Keep It Dry and Clean, A Reusable Bag with Sealing Zipper. The Silk PLA Filament Can be Put Back into Bag After Used; High Quality Guranteed, This Color Change Much Much Faster Compare Others in Market, Pls Kindly Try and Test, You will Find How Amazing It Is, And You will Find How Fast Color Changed It Is | Extra Gift & Warranty: For Each Box Filament, It's Packed with Following Free Items as Extra Gift: One Bag of Mixed PLA Different Colors Sample, Together with One Premium Quality Bottle of Solid Stick, It's Great Fix Printing Tool for Your 3D Printer Head Bed, They Are Packed and Ship Together. We are 100% Confident with Our Silk Fast Color Change PLA, If Any Question, Pls Kindly Inform us at Any Time, We'll Always Here for You, To Serve you Best