https://alexnld.com/product/dotbit-0-4mm-v6-copper-nickel-plated-nozzle-compatible-with-petg-abs-pei-peek-filament-for-3d-printer/?hilite="0.4mm E3D Dual Nozzle Metal J-head Two Color Extrusion Head Upgrade Print Head Compatible with V5 V6 for 3D Printer"