1、Safe for Children. PCL filament features a lower melting temperature to eliminate risk of burning hands. 2、High-Purity Material. Made of eco-friendly PCL material, not using scrap and recycled material, it will not create pungent odor when extruded from 3D pen, non-toxic, non-irritating and biodegradable. 3、Ultra-Smooth. High-precision PCL filament owns 1.75mm diameter to ensure your 3D drawing very smoothly without clogging, discoloration, bubbles, oily residues or breaks. Feature: Safe for Children PCL filament features a lower melting temperature to eliminate risk of burning hands. High-Purity Material Made of eco-friendly PCL material, not using scrap and recycled material, it will not create pungent odor when extruded from 3D pen, non-toxic, non-irritating and biodegradable. Ultra-Smooth High-precision PCL filament owns 1.75mm diameter to ensure your 3D drawing smoothly without clogging, discoloration, bubbles, oily residues or breaks. Total 10 Pcs 164ft This 3D pen filament refill pack enables your child to scribble 3D artistic idea freely, DIY what they want, and brings up kids to have fun with crafting and drawing. Wide Compatibility Compatible with most 3D pens on market, and not suitable for 3Doodler pen. Note: 10 pcs in one pack and colors are delivered randomly. Specification: Material: PCL Length: 5m per piece, total 164ft 10 pcs Packing list: 10 * PCL Filament Refills 10 * PCL Filament Refills