This link is for the Improved SIC Crucible Cup Heater assembly for the v4
Silicon Carbide makes the experience better, with it’s thermal properties and density, SIC is like dabbing on a non stick pan. Less charring and easier to clean for sure,, some say the flavor is better.
the assembly comes with 13mm donut heater, spacer, cotter pin, and SIC cup
, This ad is just for the SIC heater assembly