- Compatibility: Specifically designed for the 3Doodler Start 3D Pen, this filament refill pack contains PCL filament with a diameter of 2.5 mm. It is not compatible with other brands of 3D pens. - Vibrant Color Selection: Enjoy a diverse range of 22 colors, including 15 bright solid colors, 4 glowing colors, and 3 additional bright colors. The glowing options—glowing green, blue, red, and yellow—shine in the dark after being exposed to light. - Precise Dimensions: Each filament strand measures 15 cm in length and maintains a consistent diameter of approximately 2.5 mm. These specifications ensure optimal performance with the 3Doodler Start 3D Pen. - Safe and Quality Materials: Made from PCL, this filament is safe, non-toxic, and designed for low-temperature printing. Each strand undergoes quality control before packaging, ensuring a smooth printing experience. - Convenient Storage: The resealable packaging keeps remaining filaments dry and organized for future use. This feature allows for easy storage and accessibility. - Ideal for Gifting: This colorful filament pack makes an excellent gift for children and friends who own a 3Doodler Start Pen, perfect for occasions like Children's Day, Christmas, or birthdays. - Practical Applications: Create unique 3D art, educational projects, or fun crafts with these versatile filaments. Ideal for school projects, hobbyists, or family bonding activities, the possibilities are endless with this colorful refill pack.