10% chopped glass fiber reinforced ASA 3D Printing Material. This filament has excellent mechanical properties, lower warping, odor and increased dimensional accuracy. Overall this is a high tech filament that youll hopefully enjoy!This filament is highly abrasive, we strongly recommend printing with Tungsten Carbide Nozzle like the UndertakerPlease note: due to glass fibers and ASA material print in an enclosure in a well ventilated room using proper protection as printing this material will likelyrelease harmful VOCs.