[ & HEALTHIER MATERIAL]Compared to refills ABS/ 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-toxic, No odor, non-irritating and biodegradable [30 COLORS ] refill pack of 30 various colors your 3D artistic masterpiece idea and make your masterpiece glow in the dark. A great and art lover to DIY what they , 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 /3D Printers on market, Not suitable for pen [ENJOY THE of ]This 3D printing pen filament refills are excellent gifts to improve their spatial thinking, cultivate , and artistic skills. Also, a great way for parents and children to spend happy time together, strengthening the bond Colour:random color , 't accept the specified color Material:PCL Size:Length of each coil: 5M Package Contents: 30 x 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.