This product is the replacement Hotend heatsink, compatible with: 

MK4XLMK3.9MK4SMK3.9S

A high quality All metal upgrade kit for CR10 and similar machines.

High Quality MK8 Swiss Style Makerbot Heat-Break.

This is an aluminum block for the Hot-end assembly dedicated for printers using Nextruder.

Compatible with:

High Quality Hemera heat break. M4 threaded cold-side, M6 Threaded hot-side.

High Quality, Bi-Metal "All-Metal" Heat-Break.

High quality Swiss Style MK10 All-Metal Upgrade Kit w/ 0.4mm Nozzle.

High quality v6 Heat Break for 4MM OD Bowden tube

A High Quality Kraken Titanium All-Metal Heat Break

High quality Titanium alloy Swiss style Heat Break.

This product is the replacement Hotend heaterblock MINI. It is ONLY compatible with the Original Prusa MINI/+.

A complete, high quality, all-metal v6 hotend.

A high quality aluminum v6 Heatsink/Cooling Block.

A High Quality Kraken All-Metal Heat Break

A very high-quality Plated Copper Heat Block. Resistant to high temperatures, not easily deformed, and has excellent heat transfer capability making it ideal for high temperature printing.

High quality v6 Titanium Alloy Heat Break.