Soyan 3D Pen Filament Refill Pack, 12 Colors, 393.6 Feet, 1.75mm ABS Filaments Great value pack: the pack includes 12 colors filaments and 32.8ft for each color, it's tons of fun for kids or art lovers to enjoy 3d doodling. Universal filaments: you can use this filament in any 3D printing pen or 3D printer as long as it can use 1.75mm ABS filaments. NOTE: it'll not work with 3doodler 3D pen. High quality: made of premium grade material, the consistency of the round diameter provides optimum flow through the extruder, tube, and nozzle. 100% Satisfaction and 30-day money back guarantee.