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.