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