glow in dark, asolutely round shape, accurate diameter(2.94-2. ... light source and then turn out the lights, it glows green in dark! It's perfect for haunted houses, radioactive bunnies, ... /roll, 1kg/roll PLA filament 3mm/1.75mm glow-in-dark ,black,white, transparent, blue, red , yellow, green,orange, ... in assorted diameters since 2009. Esun glow-in-dark PVA PLA ABS filament welding rod for 3D printer