Used Worth CU31 fastpitch softball bat. Here's some information about it:

Type: Fastpitch softball bat, designed for players in fastpitch leagues.

Material: Performance softball alloy, likely aluminum-based.

Weight Drop: 10 oz drop, meaning the bat is 10 ounces lighter than its length in inches.

Construction: one-piece bat, favoring stability.

Barrel Diameter: Standard 2 1/4 inches.

Use: Suitable for ASA, ISA, NSA, USA Softball, WBSC, and USSSA leagues.

Features: May have a balanced feel for easier swinging.

Length: Typically ranges from 30 inches