Do you want to take your creativity to new levels?3Doodler start plastics are low-heat, BPA-free and non-toxic so they completely safe for kids, and are compatible with 3Doodler start pen only. Bring any idea to life, or personalize your existing items - safe to Doodle on almost any material, such as LEGO, 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. now with a wider range of 19 vibrant colors, available as single color packs containing 24 strands, tubes containing 100 strands, and mixed color packs containing 24 strands.