These 0.4mm MK8 CR-6 SE Nozzles are somewhat specially designed nozzles for the Creality CR6SE, and are relatively standard, but have been machined to snugly fit the silicone sock that’s included with the CR-6 SE hot end. The nozzle is made from a tough and temperature resistant alloy that is good for standard 3D Filaments, with a sharp but slightly blunted end so as to provide high precision while assisting with flattening each layer.