Material: The main block is made of Aluminum and is super lightweight and has a high heat tolerance. The Nozzle is made of brass, sturdy and high-temperature resistance. The Inside of the nozzles are smooth as silk, with out any burrs to give the best 3D Printing Results. The sock is made of eco-friendly engineering plastic that is super strong, long lasting, and will not break or deform easy. Specially Designed to get the best 3D Printed end result. Easy to Use: The Extruder kit is fully assembled and is a Plug and Play replacement part. Works with all sizes of MK8 Printer nozzles: 0.2mm 0.3mm 0.4mm 0.5mm 0.6mm 0.8mm 1.0mm nozzles. Compatible with Creality CR-10, Creality CR-10-S4, Creality CR-10-S5, Creality CR-10S, Creality Ender 3, Creality CR-10S Pro, Creality Ender 3 Pro, Creality Ender 5, Creality CR-10 Max, Creality CR-10S Pro V2, Creality CR-10 V2, Creality Ender 5 Pro, Creality Ender 5 Plus, Creality Ender 3 V2, Creality CR-6 SE, Creality Ender 6, Creality CR-5 Pro Set Contains: 1x Aluminum Heater Block; 1x Heatsink; 1x M6*30mm Throat pipe; 1x Aluminum Cooling Block ; 6x 1.75MM 0.4MM Brass Nozzle, 2x Pneumatic Fitting; Product provided by MMOBIEL - We always try our best to exceed your expectations at every turn. Join the ever growing list of satisfied customers and discover the difference with MMOBIEL.