Contrary to the implication of the comment you’re replying to, MLB has always mandated bats be made of solid wood. Aluminum bats have never been allowed and have never been used. Bats made of other materials like the ones you mention would also not be allowed. This new “torpedo” bat is made of solid wood, just in a new shape.
Thanks for the clarification. https://www.reddit.com/r/baseball/comments/1freiuv/recalling... this April fool’s video will give fun nostalgia. I guess the most accurate thing to say is that MLB at least thought about it for a second, long enough to get Jose Canseco to pretend it was happening.