Features: The MK8 extruder nozzles are through long-term testing to solve the problem of plugging and missing materials to the greatest extent, low thermal conductivity, resistant to corrosion, high abrasion resistance. Also these 3D printer extruder nozzles has impressive toughness and hardness, not only suitable for common 1.75 mm. 3D printer filaments, but also can be applied for printing filaments of carbon fiber, fiberglass, etc. The inner wall of the MK8 nozzles is smooth and has no burrs, it's viscosity coefficient is small, and extruder nozzle diameter error is less than 0.02 mm, providing you an accurate and smooth extrusion Provide around nozzles in multiple sizes for different speed/precision combinations to find your for ideal fit. Specifications: Material: Brass+Stainless Steel Size:approx 13mm x 6mm Filament: for 1.75mm Fialment Printers Screw Diameter:6mm Type: MK8 Brass Nozzles Nozzle diameter 0.2MM 0.3MM 0.4MM 0.5MM 0.6MM 0.8MM 1.0MM Item Includes: Nozzles, Needles and Wrench Set Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 40 X MK8 Nozzles 1 X Wrench 10X Cleaning Needles