What it is: A pack of 350 filaments in an assortment of bright neon hues designed for use with your 3Doodler 3D printing pen (sold separately).What it does: 3Doodler Start 2.5mm Eco-filaments are low-heat, BPA-free and non-toxic so they are completely safe for kids. They extrude up to 6 times the length of a strand, allowing one 6-inch strand to yield over 35 inches of Doodles. This combination of creativity and technology drives engagement and comprehension of critical STEM subjects. Warning: Choking hazard. Small parts. Not for children under 3 years Ages 4 and up 8 1/2" x 5 1/2" package dimensions Pack of 250 filaments in assorted colors Neon colors are brighter in person Compatible with 3Doodler Start & Start+ 3D pen (sold separately) BPA free Compostable Plastic Made in the USA; packaged in China