[ & HEALTHIER MATERIAL]Compared to refills ABS/PLA 1.75mm, PCL filament with a lower melting temperature of 70 which eliminate the risk of burning hands. Besides, PCL filament refills are 100% derived from renewable plant resources, will not create pungent odor when infused into , non-, No odor, non-irritating and biodegradable [20 COLORS ] refill pack of 20 various colors scribble your 3D artistic masterpiece idea and make your masterpiece glow in the dark. A great for kids and art lover to DIY what they want, and bring up kids to have fun with crafting and drawing [ULTRA-SMOOTH]PCL filament for with Low temp releasing technology and high-precision PCL filament 1.75mm diameter your 3D drawing very smoothly without oily residues or , no clogging [UNIVERSAL COMPATIBILITY]Compatible with most 3D Pens/3D Printers on market, Not suitable for pen [ENJOY THE FUN of CREATION]This 3D printing pen filament refills are excellent gifts for kids to improve their spatial thinking, cultivate creation, imagination and artistic skills. Also, a great way for parents and children to spend happy time together, strengthening the bond PCL Filament Refills PCL Filament Refills PLA Filament Gold Silver Handles Tray Handles size:Length of each roll: 3.0m Material:PCL colour:Random Color 20 kinds of colors are random, can not choose to specify Package Contents: 4 x 3D Printing Pen PCL Filament Refills set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.