100% Safe for Children: 3D PCL pen filament is crafted to a high standard of quality, which is extracted from biodegradable materials. Compared to 3D pen filament refills ABS/PLA 1.75mm, PCL filament is no odor, non-irritating when infused into 3D pen. It is the 100% safe option for children's crafts and adult arts.Rich Colors: This 3D filament set comes with 30 colors which make your masterpiece glow in the dark. With this refill set for your 3D pen for kids, you get all the colors you want!Technology Upgrades: PCL filament for 3d pen with low temp releasing technology and high-precision PCL filament 1.75mm diameter. Never worry about nozzle clogging, discoloration, or bubbling. You get 3D pen filament that works smoothly every time. Without oily residues or breaks. The shape is brighter in color and better in impact resistance.Ideal Gift: This set of 3D pen PCL filament refills is a nice gift for kids to improve their spatial thinking, cultivate creation, imagination and artistic skills and a great way for parents and children to spend happy time together.