MK10 0.40mm H4 Hardened Steel Nozzle from Performance 3D 

This wear-resistant, high lubricity nozzle is suited for any printer that uses an MK10 nozzle.

These nozzles are manufactured using heat-treated A2 tool steel which has been hardened completely through.

With 50% better heat transfer than stainless steel nozzles and 25x to 100x more wear-resistance, Hercules nozzles provide extreme durability for printing the harshest filaments.

For 1.75mm diameter filament

Made in Ohio USA.