What it is: 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. What it does: Color Switch Solo allows the makeup artist to quickly and efficiently switch between colors on your eyeshadow brushes. What else you need to know: The Solo sponge can be used on either side and can be washed or replaced with a refill pack. Discontinue use of product if irritation occurs on eyes or skin.