Set of professional makeup sponges, from the company Jessup Beauty,

How to use the beauty blender:
The sponge gives a more transparent, sheer finish to your makeup. It is more relaxed and helps with quick blending and application.
Fully wet it until it swells and squeeze it to remove excess water. With the round/flat surface of the sponge, take small amounts of the material and apply it to your face by dabbing, without pressing too hard and especially without dragging it. This way you will be able to gradually build up the foundation until you achieve the desired airbrushed coverage.
With the tip of the sponge, you can take small amounts for delicate areas such as the nose, chin, under the eyebrows, and under the eyes. The tip of the sponge is also used for contouring with greater care and precision, as well as for applying concealer to small areas such as pimples and marks.
The flat surface is mainly used for blending foundation.
The round surface is mainly used for applying pressed powders.

How to clean it:
After each use, wash it under warm running water while squeezing it to release the absorbed products. Let it dry naturally.