If you need to use the. guidelines to cite sources, there are two formats you can use. The author-date format is often used in the physical, natural, and social sciences, while the note-bibliography format is more common in the humanities (literature, history, and the arts).
The BBCOR one-piece bats are made of composite or metal and they are one solid piece from the barrel to the handle. The two-piece bats have separate barrels and handles. The two-piece bats usually have different materials, with a composite handle and a metal or composite barrel.
â¢ It has a barrel made of composite material. (The entire barrel of a LEGAL bat should be made entirely of metal, typically aluminum. By contrast, composite bats are made of a carbon fiber blend.) See below for a reference list of composite bats. Composite bats are illegal in all levels of play except Open B, CC, and C.