Original Hot end kit for X3 SERIES AND X4 SERIES. These are assemblied by Artillery. Artillery do not use any thermal paste. It may be advised to add some. Personally i would use less than the video below.

1x thermistor

1x 48w ceramic heater

1x titanium heatbreak

1x brass 0.4 nozzle

1x nickel plated block

1x silicone sleeve

1x block retaining clip

1x gd900 0.5 thermal paste

Assembled.

Warning; be careful removing the silicone sleeve, it can drag the holding clip and damage the thermistor and ceramic heater.

The youtube video instructions are for a Bambu lab. Similar hotend design;