For the S1, S2, S5 and K5 milling machines, the block holder devices are available for milling the following materials: E-max, Empress, Mark II, Suprinity, Enamic, Triluxe, RealLife, Shofu Hc, Ultimate, Cerasmart, Celtra Duo, Obsidian, N! Ice, etc… Some of these are workable only if the WGO wet module is present.