I have been wanting this thing forever but it has always been sold out at sephora. Basically it's a little sponge in a tin that you swipe your makeup brush on to take any product off; so you can use a new colour without it being contaminted from the last colour. Absolutely great tool to have if you're a professional or someone who takes their make application very seriously. And it's easy to wash and reuse when it gets too dirty.
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