It seems like there might be a formatting issue with your question. However, if you're inquiring about "bb cream," it is a cosmetic product that is a combination of skincare and makeup. It is designed to provide hydration, sun protection, and light coverage. The specific details, positive and negative aspects, as well as the ingredients or materials, can vary depending on the brand and type of BB cream. If you have a specific BB cream product in mind, it's best to refer to the product's packaging or the manufacturer's website for the most accurate information.