If you want to know the answer you have to go to this website:
Is BPF 15 little league bat rating the same as 1.15
The "BPF" rating is stamped on the tapered part of the baseball bat, just above handle/grip. The way I understand it, if your bat doesn't have the new USSSA BPF stamp, its not legal to use in most leagues. Check your local league for clarification.
A United States Specialty Sports Association (USSSA) 1.15 Bat Performance Factor (BPF) is a small barrel baseball bat. The BPF standard is based on the laws of physics.
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BPF is bat performance factor or the bounciness of the bat. The higher the number the more bounce a bat has which translates to the ball coming off the bat with more speed and inertia. Sanctioning bodies limit the BPF typically to a 1.20 or less.
BPF is the Bat Performance Factor. When a bat is tested, it is fixed in a stationery position. A ball is launched at a high speed towards the barrel of the bat. When the ball bounces off of the bat, the speed is recorded to find out how much faster it goes when it comes off of the bat. That is how the BPF is calculated. If the ball comes off of the bat at the same speed, the BPF is 1.00 If the ball comes off of the bat 20% faster, the BPF is 1.20
Sports Authority, I did verify they have softball bats with 1.21 BPF.
The -8 is a Senior League (big barrel) bat. that category has no governing rules (yet), so no one measures their BPF.
It was 26 pitches