The Jack Corbett MLB Hollywood Base is the exclusive base of the MLB for nearly 70 years and is also used by the National Pro Fastpitch Softball Clubs. This base has an extended tapered lip the virtually eliminates all the edge turn up that cheap imitation bases have. The Jack Corbet Hollywood Base is engineered to better withstand bad weather and also includes special ultraviolet inhibitors. These bases are the best of the best, and used on every MLB field!