Well I was in the ball park, maybe I was thinking of kief screens.

8 Bags for the utmost in quality and versatility.
This kit includes the following bags: 25 micron; 45 micron; 73 micron; 90 micron, 120 micron; 160 micron; 190 micron; and 220 micron; plus a pressing screen and storage pouch.

and the 4 bag kit:
This kit contains the following four bags:

220 micron Work Bag: This bag is used to mix the plant material with water and ice

160 micron Contaminant Removal Bag: This bag will remove small bits of leaf matter, dust and other contamination from your Bubble. The material captured in this screen can be used for cooking.

73 micron Crystal Catching Bag: Your best herbal extract will be found in this bag. If your plant matter is of a very high quality, you might even get Full Melt Bubble in this bag.

25 micron Crystal Catching Bag: For strains with smaller crystals, this bag is the one. This is the smallest pore size on the market and will make sure that absolutely no crystals escape.

Now if that don't answer your question I don't know what will.