The 2017 Mizuno Covert -10 Senior League Baseball Bat: SL17COV10 features a 2 3/4" barrel diameter.
This 2017 Mizuno Covert -10 Senior League Baseball Bat (SL17COV10) will be a hybrid bat (alloy barrel and composite handle) with a -10 length-to-weight ratio and balanced swing feel to it. The 2016 Mizuno Nighthawk (SL16NHXL) will also be a hybrid bat with the -10 length-to-weight ratio and balanced swing feel. For the most part, the Covert was the 2017 replacement for the 2016 Nighthawk; but you will notice different alloy materials for the barrels of the two bats.
The 2017 Mizuno Covert -10 Senior League Baseball Bat (SL17COV10) features a two-piece hybrid design. This will cause it to limit vibrations and not sting even if you miss the sweet spot. Its hot metal aluminum design offers great performance and durability. It has adjusted wall thickness to create a larger sweet spot and is a great option.