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.
Wood bats don't have as much give to them and the ball loses much of its energy upon impact. The BBCOR standard ensures that non-wood bats perform more comparably to wood bats in an attempt to level the playing field and improve player safety. All BBCOR bats will carry the BBCOR Certified .50 mark (pictured above) somewhere on their barrel or taper. Additional requirements for a bat to become BBCOR Certified include a length to weight ratio that is no greater than -3 and a barrel diameter that does not exceed 2 5/8 inches.