That is an 11 pound block of something a guy is selling as lead. Although I have no hands-on experience with babbitt bearings, I suspect that is a babbitt bearing that was cut/split off a shaft of some type. Roto-Metals is selling various babbitt grades for $27 a pound and from what I have read, adding a bit of babbitt to a coww alloy can make for some seriously hard bullets. I don't currently have the need, but would snag it for the right price assuming it could have future use/value and is in fact babbitt.
Any babbitt bearing experts out there have an opinion?