主题：***（品牌名） - Business Cooperation
This is Ella from Marketing Division at ***（公司名）. （自我介绍）
I’ve been watching your YouTube channel/ Facebook posts for a while, and there is something that makes you different from other influencers. I love your posts so much! You have a very attractive voice/ very good literary talent that makes me want to watch this video/ your posts all the time. Your character goes well with our brand image. （表示赞美）
We are **, ... . You can check us on social media or Google.（公司以及主营产品的介绍，简单几句即可，不必长篇大论）
Here is our website:
We would like to cooperate with you, We can send you 10 pairs of FREE ***（产品） and you can help us mention our brand and products in your videos/posts. You can choose which you like and we’ll ship them to you whenever it is convenient for you.
Many influencers have already endorsed our brand, Here are some links that you can check: xxx.com
If you are interested, you can reply to my email and I’ll give you more details.
Thanks for your time and look forward to hearing from you.
Have a good day,