This set includes a heater and temperature sensor for printers using Nextruder, the aluminum block that is a clone, and a right fit silicone sock together with - basically all you need for prusa sk4 sk3.9 daily accessories replacement. You can swap out the stock thermistor with this 104NT temperature sensor, which can handle long hours of printing at temperatures up to 300℃/572℉. It's made with a 304 stainless steel cover and comes with about 4.7 inches of wire and a 2-pin connector. Plus, it's compatible with print head cylinders that are 3mm in diameter and 15mm in length, just like v6 heating blocks that support the thermocouple. You can swap out the stock thermistor with this 104NT temperature sensor, which can handle long hours of printing at temperatures up to 300℃/572℉. It's made with a 304 stainless steel cover and comes with about 4.7 inches of wire and a 2-pin connector. Plus, it's compatible with print head cylinders that are 3mm in diameter and 15mm in length, just like v6 heating blocks that support the thermocouple. Need to replace your heating components? These 24V heater elements are designed specifically for Prusa MK4 machines and can be directly installed when the cord breaks off. Just keep in mind they're not meant for neptune3 plus 3 neo e3 or other models listed here. This stuff works great with i3 MK4 MK3.9 but not compatiblewith old prusai version hotends like MK2 MK25S MK33S+ color:Photo Color Material:metal Package Contents: 1 x heating block 1 x Temperature measuring line 1 x heating rod 1 x Silicone cover 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.