Shop our NSA Slowpitch Bats right here at Kellys Sports. We have the top 2021 Approved NSA Bat line. Financing Available in Checkout. Free Shipping US48! Make sure to get the Bat Break in Service for the BEST Bat. Questions 707 399 7945. NSA Slowpitch Bats vary in weights from 24 ounces to a maximum of 30 ounces. When choosing what weight your bat should be, go by your past experiences and the unwritten law on it is that it is always better to error on picking a bat on the lighter side versus the heavier side.