FOXWILL 3D PEN FILAMENT REFILLS - 1.75mm PLA Filament 3D Printing Pen Refills 340 Linear Feet x 20 Different Colors (16 Colors+4 Glow in Dark Colors) 17 Feet Per Color Sales Promotion (PLA) 20 Color Pack PLA Plastic Refills Each in 17 Foot, the Best Mixed Color after Survey. 1.75mm Filament Diameter (Dimensional Accuracy +/- 0.05mm). Protected from weathering! Individually wrapped filament packets keep each coil fresh until you need it! For Most 3D Pens or any 3D Printing. Manufacturer Guarantee: We back our products with a Lifetime Money Back Guarantee, If you're not satisfied, simply contact us and get a full refund.