ASA_Softball_LogoThe IJMST follows the ASA Governing Body of Softball

ASA Approved Bats

The official bat in ASA Championship Play must meet all of the requirements of Rule 3, Section 1 and:

  1. The Official bat must bear either the ASA approved 2000 certification mark , the ASA 2004 certification mark as shown below, or the ASA 2013 Certification Mark (Slow Pitch ONLY) as shown below and must not be listed on an ASA Non-Approved Bat List with Certification Marks, and
  2. must be included on a list of approved bat models published by the ASA National Office; or
  3. must, in the sole opinion and discretion of the umpire, have been manufactured prior to 2000 and if tested, would comply with the ASA bat performance standards then in effect. This includes Wooden Bats.

For further information on bats, click the respective country:

ASA Non-Approved Bat List with Certification Marks

ASA Approved BallStone Ball

As a democracy, the Trump Rock ASA Slow Pitch Softballs  presented a conflict for some members, consequently
The DeMarini Stone Ball which also is .52 Core, 300 lbs compression will be in play for 2017.


  • 12 inch
  • .52 Core
  • 300 Comp
  • Red Stitch
  • Poly Core
  • Composite Leather Cover
  • ASA Stamp

ASA Ball Rule Change

Rule 3 Section 3E [3]: EFFECTIVE 2014: The 52/300 12 inch ball will be the only 12” ball allowed in Men’s Adult Slow Pitch, Men’s Co-ed, Men’s Master’s Slow Pitch and Junior Olympic Boys Slow Pitch, with the exception of Seniors.

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