Proto-pasta Composite Stainless Steel PLA, 1.75 mm 125g This stainless steel-filled PLA can be polished to look like polished metal! It is also 2X the density of PLA for substantial-feeling prints Material is matte gray with a cast metal look. Can be polished with proper tools to a semi-reflective finish Processing is comparable to standard PLA. No heated bed required. Process may be less consistent on smaller nozzles (&lt;4mm) andor bowden Type machines We recommend printing this material at 190c-230c using a 4 mm or larger nozzle. Please Note that this filament is more brittle than normal PLA and requires more careful handling to prevent breakage Designed and manufactured in the USA with quality and customer service as top priorities. USA-sourced packaging and labor