Compatibility: Compatible with K1 / K1 Max / CR-M4 / CR-10 SE / Ender 3 V3 KE 3D Printer; Genuine Ruby: DUROZZLE takes genuine ruby as the tip material for all its ruby series nozzles. It offers excellent durability and resistance to highly-abrasive filaments like carbon fiber, glass-infused materials, or metal-filled filaments; Excellent Thermal Conductivity: Brass body can guarantee an excellent thermal conductivity from your 3D Printer's heater block to the nozzle; Funnel Shaped Nozzle: DUROZZLE's Ruby nozzle is carefully cut and polished to have funnel shape structure. This will avoid accumulating material at the dead corners in this way to reduce risk of carbonization and nozzle blockage; One For Any Material: Having great performance in printing highly abrasive materials, less abrasive materials such as PLA, ABS or Nylon are never challenges for it. Ruby nozzle can improve the nozzle service period in an obvious way, keeping you free from replacing nozzles frequently. DUROZZLE takes genuine ruby as the tip material for all its ruby series nozzles. It offers excellent durability and resistance to highly-abrasive filaments like carbon fiber, glass-infused materials, or metal-filled filaments. It can also print standard materials such as PLA, ABS, PETG, TPU etc.