 So that's mean that all the tools During but from the beginning of the shaping until the polishing at the end when you have the final product will be Abrasive the abrasive powder. So you will have different type of hardness and coarseness. Okay of these things for instance So like carborundum and silica. Okay, not at this time. It was Let's say emery or corandum. Okay, the diamond powder as well. Okay. Let's mean that for instance here. This is pieces of emery. All right. Okay So these is a harder stone than Rock crystal and so it was crushed into powder. So I've got here some example of Corandum powder So this is a very fine natural powder. Okay, obtained from crushing bead stone Or here, but this is an astreal corandum. Okay. Okay. So this is the type of things So this is for the beginning of the process, but when you want to obtain something finer, right? You are going to use finer powder. So for instance for the polishing process It is aluminum oxide, which is used still nowadays. Okay. Yeah to polish Rock crystal, so this is aluminum powder. So yeah, this is oh, yeah, this is very fine the one. Yeah, it looks like yeah baking powder So all these powders was you were used of course with water Okay, right and also for the coffee process and maybe for some of the polishing process with oil. Okay Right