Safe to Handle The XYZprinting da Vinci 3D Pen Cool is compatible with Polycaprolactone ( PCL ) , a biocompostable polyester with a low melting point. PCL filaments specifically have low viscosity and good are a thermoplastic, so melted PCL can easily stick to PLA prints. Environmentally Friendly XYZprinting's PCL filament is a biocompostable material which has been tested rigorously to ensure it's heavy metal free. The filament can be used without fear. Specifications Filament Diameter: 1.75mm Filament Weight(N.W.): 200g /11lbs Shipping Weight(G.W.): 353g /0.78lbs Filament Length: 8m X 9 rolls Color: Red, Tangerine, Yellow, Green, Blue, Neon Green, Purple, White, and Black ※ PCL is compatible with these 3d printers: da Vinci 3D Pen Cool