The Crafty Pen 1.75mm PLA Filament Variety Pack contains an assortment of 40 strands of PLA (Polylactic Acid) filament for use with the Crafty Pen, or any 3D printing pen that requires 1.75mm filament. This filament is made in the USA and features a variety of vibrant, opaque colors, including red, white, black, blue, and green. Each strand is 10 inches long for a total of 400 inches of plastic to create with, sealed in a plastic container with desiccant to keep your filament fresh and working with your 3D printing pen. When not in use, we recommend keeping your filament strands in the plastic container with the desiccant. This ensures that your strands keep printing for as long as you need them. When crafting, use the PLA heat setting on your 3D printing pen (or print at 256 - 392°F / 180 - 200°C).