Color Switch Solo by Vera Mona allows the makeup artist to quickly and efficiently switch between colors on your eyeshadow brushes. It is an essential tool that is extremely helpful while doing multiple jobs or different looks. Simply glide the eye shadow brush against the unique Solo sponge to completely remove eyeshadow color. Saving the user time and money. The Solo sponge can be used on either side and can be washed or replaced with a refill pack. Discontinue use of the product if irritation occurs on eyes or skin.