The 37 micron mesh size is a great choice for dry sift, bubble or other fine material. It can also be used for flower if you are looking for very clean rosin.
Rosin Evolution bags is known for their quality & features:
Dimensions: 5,08 x 11,43 cm (2x4,5" inches)
Rosin Evolution bags are designed to withstand heat and pressure.
Each bag will hold 15-25 gr. and is turned inside out for maximum yield.
The 37 micron bag also has a custom seam specially designed to contain fine particles and prevent blowouts.