Color switch duo allows you to switch the color on your eyeshadow brushes by simply gliding the brush against the surface of the black sponge. The duo also has a wet sponge in the center for wet eyeshadow application.InstructionsStroke your brush against the Duo sponge to completely remove eyeshadow color and then switch to the next color. The Duo also has a wet sponge in the center for wet make up application. Discard wet sponge after every use. Discontinue use of the wet sponge if irritation on skin or eyes occurs.WarningsSafety Warning: Wet sponge in the center for wet makeup application should be discarded after every use. Discontinue use if irration occurs on skin or eyes when using the dry or wet sponges.