Easton Omen Aluminum Baseball Bat 31in. -11 drop weight. (21 ounces) 2 5/8 Barrel Dir. Lightweight but powerful. Hyperite Matrix Alloy. Butt nor End of the bat has any visible dents. Grips in excelent condition. Only used a few times. Some scuff marks on the barrel. A bat weight is measured by the minus or drop weight. Drop weight is the difference between the length of the bat and the weight of the bat. So a bat that is 30 inches and has a drop weight of (-10) will weigh 20 ounces.