What you will get: the package has 10 pieces 3D pen PLA filament refills in different colors; 10 Beautiful colors provide more choices for your artistic creation Size detail: the size of each 3D printer filament refill is approx. 16.4 feet/ 5 m, the diameter of the PLA filament is 1.75 mm, which is suitable for most 1.75 mm 3D pens and printers (size accuracy: +/- 0.05 mm); Please confirm whether your printing pen is suitable for the size of this product before buying to avoid problems caused by size errors Safe material: PLA is a polymer material synthesized from corn starch, non-toxic and without any waste; 3D PLA pencils will not produce peculiar smell or smoke when printed, safe to use, which are choices for children's handicrafts and adult art; Because the diameter of the 3D printing filament refill is relatively small, please be gentle and cautious when using it to avoid excessive force which may cause broken core Smooth design: 3D printing filament is made of quality material, which is always round, has a smooth surface and without oily residues or breaks; It can produce pretty colored lines without bubbles; When you use, the filament can be heated in the printing pen for a longer time to avoid the problem that the filament cannot be applied because there is not enough time to heat the filament to melt Ideal gift: this set of 3D pen PLA filament refills is a nice gift for family, relatives, friends, neighbors, students, etc.; Their colors make any recipient very willing to receive them