Geeetech Silk PLA Filament 1.75mm for 3D Printer, Metal-like Shiny Consumable 1kg (2.2lbs) 1 Spool, Dimensional Accuracy +/- 0.03 mm,Metallic Black

These filaments designed with high accuracy of 1.75mm(±0.03mm),which are universally compatible with most FDM 3D Printers.As for 3D pen,It can be used as long as the size of fiaments can appropriate whith the pen.Do these silk pla filaments contain metal? No,these silk filaments are just the colors show a metallic luster,not real contain metal.so please rest assured to normally use it.For the silk rainbow pla, how many meters of each color before it changes to the next color? The first color of this spool is random, and the color changes about every 13 meters.