The Official Bat

• The bat must be a smooth cylinder with a knob. Only bats that pass through a 2-1/4-inch (5.7150 cm) diameter bat ring are legal.
• The bat must be no more than 2-1/4 inches (5.7150 cm) in diameter at its thickest part, no more than 34 inches (86.360 cm) in length, and not exceed 38 ounces (1077.30 g) in weight.
• No devices, attachments, or wrappings may cause the handle to become flush with the knob.
• All bats must meet the USA/ASA bat performance standard. Laser etching (other than on the barrel) is permissible.

Certification and Approved Models

• All bats must bear the USA/ASA approved certification mark and must not be listed on an USA/ASA Banned Bat list unless it bears the USA/ASA approved recertification mark.
• A bat is legal if it is included on a list of approved bat models published by USA/ASA.
• A bat may be legal, in the sole opinion and discretion of the umpire, if it was manufactured prior to 2000 and, if tested, would comply with the USA/ASA standards then in effect.

Grip, Tape, Resin, and Pine Tar

• Safety grip or cork, tape (no smooth plastic tape) or composition material may not exceed two layers of tape and must be a continuous spiral.
• Any resin or pine tar is permissible on this part of the bat.
• Tape must be at least 10 inches long and not more than 15 inches.

Embedded Metric Sensor in Knob