4 Spools of Glowing in Dark PLA Filament Bundle: One Spool Glow in Dark Green, One Spool Glow in Dark Blue, One Spool Glow in Dark Purple, One Spool Glow in Dark Fast Color Change Rainbow; The Glow in Dark Green Color with Most Fluorescent Effect Compare Other Colors Glowing in Dark. Total 4 Different Glowing in Dark PLA Packed in One Box; Each Spool Net Weight is 250g, 4 Spools Packed, Total 1kg 3D Material Packed in One Box | Our Glow in Dark Sereise PLA Filament, It Will be Glowing in Dark after Absorbing UV Light. It Looks Natural Color at Day, While It Has Amazing Fluorescent Green in Dark After Exposure to Strong Sunlight or UV light; To Get Amazing Luminous Effect, Pls Expose the Finished Printed Item to Directly Bright Sunlight, or UV Light for Around 20-30 Minutes; Recommend Light Sources: UV Light, Directly Strong Sunlight. Directly Sunlight Works Quite Good | 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 Suggest to Exposure Filament at Sunlight Around 30 Minutes. Perfectly Compatible with Most of the FDM 3D Printers and 3D Pens in Market, Melt Well and Feed Smoothly, No bubble, No Jamming, No Warping, Easy to Print | 100% Tangle-Free Tips and Printing Setting: For our Filament, We Use the Servo Machine, To Doing Our Best to Make the Filament Line Winding as Neatly as It Can, Also All of Our Filament are 100% Tangle-Free during Production, After Each Time Use, Pls Kindly Fix Filament End, Pls Make Sure to Insert Free End of Filament into Spool Holes, to Avoid Being Tangled for Next Time Use; Suggest Print Temperature: 200°C-220°C | Widely Application and Package: Our Glowing in Dark Series PLA, After Absorbing UV light, It's with Amazon Strong Fluorescent Effect in Dark, It's Very Suitable for Printing Gift, Decorations for Party, Thanksgiving and Christmas, Glow Sticks, Lampshades, etc. If You Have Any Question During Use, Pls Kindly Inform us at Any Time, We'll Always Here for You, We Are High Confidence of Our PLA Filament, Pls Kindly Try and Test, We Are Always Here to Serve You Best