[ & HEALTHIER MATERIAL]Compared to filament refills ABS/PLA 1.75mm, PCL filament with a lower melting temperature of 70 which 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 [30 COLORS ] filament refill pack of 30 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 with crafting and drawing 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 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 Colour:random color , ' accept the specified color Material:PCL Size:Length of each coil: 5M Package Contents: 30 Rolls x Filament PLA 1.75mm 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.