Optimized for A1 Series: Specifically designed for A1 and A1 Mini 3D printers, this nozzle kit ensures a and seamless operation, enhancing your printer's performance. Material: Made from hardened steel, these nozzles resist wear and tear standard brass nozzles, making them ideal for printing with abrasive materials. Enhanced Print Quality: Upgrade your printer's capabilities and achieve finer details and smoother finishes with these -crafted nozzles. Applicable consumable diameter: 1.75mm Nozzle hardness:Overall hardness 50 degrees ( hardness 55-60 degrees) Nozzle inner diameter: 0.4mm Color:Black Material:Hardening Steel Package Contents: 5 * Nozzle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.