The Revo Hemera upgrade kit gives you all the parts you need to enhance your Hemera with the power of RapidChanging. No more tools or hot tightening! This kit includes a Hemera heatsink with a revised design that's compatible with a Revo HeaterCore and Revo Nozzles. - Updated Hemera heatsink adds compatibility for Revo Nozzles and Revo HeaterCore - Easy upgrade! Just swap over your old Hemera heatsink and attach the Revo HeaterCore - Comes in your choice of a single Revo Nozzle or a Fully Loaded Nozzle Kit - Compatible with 1.75mm filaments