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.
All non-wood bats that have a Bat Performance Factor (BPF) of 1.15 or less are approved for play. High School and College Bats. High school and college bats now have to be BBCOR (Batted Ball Coefficient of Restitution) Certified. This new measurement standard replaces the old BESR (Bat Exit Speed Ratio) Certification. Look for the stamp on the right indicating certification. The new standard is designed to measure the trampoline effect of the bat and ball on impact, rather than just the exit speed of the ball.