Note Please: The full set of hotend kits is suitable for Prasu MK4 ONLY, DO NOT fit Prusa MK4 XL, because the thermistors are different.It is a good replacement for Prusa MK4 hotend partsThe separated structure is more conducive to replacing nozzle and saving costs.Bi-metal throat tube is made of and titanium, with good heat disspation, rapid heating 500, smooth 0.4um, good thermal insulation.Thermistor for Prusa MK4Thermistor - 104NT-4-R025H42G (300 max).Suitable for Prusa MK4 ONLY, not suitable for Prusa XLHeating Rod/Heater - 24V 40WHeating block for Prusa MK4It is made of alnuminum alloy, can meet most printing needs.For Prusa MK4 ONLYNote:Installation guide not included, we strongly recommend you professional installation.Please check as much as possible to make sure the item is what you need.Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect UseColour:As ShownMaterial:Aluminum AlloyPackage Contents:1 x Aluminum heating block1 x Thermistor1 x Heater 1 x Silicone sleeve1 x Hardened steel nozzle 0.4mm1 x Bi-metal throat tubeOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.