Putting 3 to 4 of these metal balls into a container of Mr. Color or any water based hobby colors will be used to the stir the paints. After putting the balls in and lightly stirring them, the particles of the paint from the bottom will be evenly mixed. The paint won’t easily clump up with matte, metallic, and pearl. After putting a couple inside Mr. Color or any water based hobby paint, firmly grip the container and please shake well to stir.