1. This product is a high-quality light weight compact ceramic heating core hotend specially customized for Prusa MK4&XL and it can be a drop-in replacement. 2. Compact form factor: Reducing potential damage from failed parts collisions. 3. Fast heating response.<br><br>Time required to heat up to 250 degrees Celsius: CHC for MK4 55 Seconds Stock aluminum heating block 86 Seconds Copper alloy heating block 112 Seconds No other modifications required. (One PID tuning may be required) Installation video:https://.be/9F17r-o-?si=nzIW8NCc4Ptjv3f9 Colour:Black & White Material:Plastic+Metal+Ceramic<br><br>Package Contents: 1 * Ceramic Heating Core Kit 1 * throat 1 * nozzle<br><br>Only 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.