Birdman Bats Professional Series 'UD13' ULTRA Dense Maple Baseball BatThe UD13 is an "Ultra Dense" modern redesign of the infamous i13. This bat features the long barrel profile of the i13, but narrows it down to add not only balance, but durability. It has a tapered thin handle to give it wonderful feel and guidance through the zone. This is a new modeled we introduced to the pros this past year and it has quickly become a top seller. This bat is put through our patent pending "Juicer", which compresses and burnishes