The Polaroid 3D Wood Filament Set of 15 contains three different wood filaments finishes, five reels of each and are all vacuum packed to keep them in perfect condition until ready to use. Each 15g pack lasts approximately half an hour of continuous drawing. PLA plastic is an environmentally friendly bio-compostable plastic made from corn starch. Each 15g pack contains standard 1.75mm diameter material. The Polaroid Play 3D filaments can be used with ANY suitable 3D PLA Pen