Proto-pasta HTP21705-CF High Temperature Carbon Fiber Spool, PLA 1.75 mm, 500 g, Black Includes the benefits of carbon fiber with substantially increased temperature resistance when annealed. Comes on fully corrugated recyclable spool with standard dimension Matte Black finish on prints that hides layer lines for more attractive Printed parts Processing is comparable to standard PLA. No heated bed required. Process may be less consistent on smaller nozzles (&lt;.4mm) and/or 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