Wide Compatibility: This 3d pen filament refills pack of 31 colors compatible with MYNT3D, SCRIB3D, PIKA3D etc. most 3D printing pens for kids which use 1.75mm PLA filament refills, But NOT COMPATIBLE WITH 3Doodler start Pen. Shining 31 colors: 3d pen filament refills pack include 4 glow in dark filament refills, 2 Metallic filament refills and 25 Solid Colors filament refills for your creativity. Color list: glow Purple, glow Orange, Pink, Black, Light Brown, glow Blue, Grass Green, Yellow, glow Red, Coffee, Matte Black, Grey, Light Blue, Yellow Green, Green, Red, Apricot, White, Dark Brown, Blue, glow green, Sky Blue, Orange, Gold, Ivory, Dark Purple, Dark Blue, Lime Green, Light Purple, Purple, Rose red. Safety For Kids: The 3D pen filament refills package is not only creative but also safe, it not only meets FDA food standards but also in line with the RoHS standards, start exciting 3D printing with Kretrum PLA 3D pen filament refills Scenarios: The package of 3D pen filamen