Who are BCF Partners and why do they want to buy my mineral rights?

Has anyone heard of BCF Partners Capital II, LLC? I received an offer from them, but found they’ve only been in business for one year. Also, looking for thoughts on the offer. It’s in Weld County, Colorado; for only a portion of the acres I own at $12031.10, and then it says 12.5% royalty interest. I’m not sure what all this means. I inherited the rights and the rest of my fathers family doesn’t really talk to us.