Proto-pasta Composite Iron PLA, 1.75mm 500g Magnets stick to this material and Printed parts made with it Material is matte Gray with a cast metal look. Surface can be rusted with a water mixture for an age distressed look 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 breaking Designed and manufactured in the USA with quality and customer service as a top priorities. Usa sourced packaging and labor