Cheap cht nozzles are fully made out of brass and the insert is

10pcs 3D Printer Nozzle for 1.75mm Filament V6 Clone

Testing a $2 High-Flow nozzle from Aliexpress — CNC Kitchen

Bondtech CHT ® Coated Brass Nozzle for MK8 hot blocks 1.75mm

E3D V6 Nozzles: Buy or Lease at Top3DShop

14 Pcs M6 3D Printer Nozzle 0.4mm Extruder Brass

Bondtech CHT™ Coated Brass Nozzle - Filastruder

Buckner - 360SAX18PG - 1'' Full/Part Circle Brass Impact Sprinkler

Bondtech CHT Coated Brass Nozzle Pack

Nozzles Bondtech CHT BiMetal V6/MK8/Volcano

Upgraded V2.0 CHT Nozzle for Bambu Lab X1C / P1P / P1S High Flow

Bondtech CHT BiMetal M6 Coated Nozzle - 0.40mm

Features: brand new and high quality. This is designed according to the nozzle CHT-clone to provide twice the flow rate than the ordinary v6 nozzle

10pcs 3D Printer Nozzle for 1.75mm Filament V6 Clone-CHT Tip Nozzles Brass Copper Print Head 0.4mm High Flow (0.4mm)

BondTech CHT BiMetal MK8 Nozzle - 3DJake International

BondTech CHT Coated Nozzle for Creality Spider hotends - 3DJake

They are manufactured by Bondtech in-house,and will fit the following hotends/blocks:, Mosquito® / Magnum, Mosquito® Liquid, Mosquito® Magnum+,

Bondtech CHT® Coated Brass Nozzle