How to inspect fine beauty blender?

A fine beauty blender never eat foundation inside, no matter how you blend it with foundation, no matter how much foundation there is on its surface, It is super clean inside. Shenzhen YRSOOPRISA PRO Beauty Co., Ltd A Leading Factory for makeup brushes set, makeup sponge, makeup tools for over 12years, that integrates R&D, production and sales in Shenzhen City, China