3Doodler Start plastic filaments is compatible with the 3Doodler Start 3D Pen & 3D Build & Play. Do you want to take your creativity to new levels? The 3Doodler Start plastics are low-heat, completely safe for kids, and are home compostable. Bring any idea to life, or personalize your existing items - safe to doodle on almost any material, and the plastic can be easily removed, though will adhere firmly to clear plastics. 3Doodler Start plastics extrude to 6 times the original length, so one 6 inch Strand gives over 35 inches of doodling.