I bought the Sponge Soiree box today but can't find it so I'll review these. The Sponge Soiree box has these plus one long one that you put on your finger, a rectangular one and a few others. I have to be honest, I have no clue what most of them do. I am 100% confident in my ability to find uses for them. I used the tear drop shaped one to apply my foundation today and I have to say, it's pretty foolproof. I used to only use my fingers to apply foundation but then discovered a flat top brush. I've been using that for MONTHS, every day. Now, I'm probably going to use this sponge during the day for a lighter look and the brush at night for a more full coverage effect. *Note: I have been using these for about a month now. They get stained very badly even though I do not wear long lasting makeup and I wash them thoroughly after each use. I'm not sure if all blending sponges stain like this or just this brand so I have nothing to compare it to. Also, it doesn't effect the performance of the sponges so I'm not worried about it.