What are the specific rules for Adult Baseball bats?
According to the 2007 NFHS Baseball Rules Book the following rules pertain to the use of bats for high school and college play. Rule 1-3-2 The bat which may be wood or non-wood product shall be a smooth cylinder implement with a knob that is permanently and securely fastened. All non-wood bat shall meet the Ball Exit Speed Ratio (BESR) performance standard, and such bats be labeled with a silk screen or other permanent certification mark. No BESR label, sticker or decal will be accepted on any non-wood bats. There shall be no devices, attachments or wrappings that cause the handle to become flush with the knob. Molded grips are illegal. Rule 1-3-4 A wood bat may be roughened or wound with tape not more than 18 inches from the handle end of the bat. No foreign substance may be added to the surface of the bay beyond 18 inches for the end of the handle. Each bat shall be: In diameter at thickest part: (wood) 2 3/4 inches or less In diameter at thickest part: (non-wood) 2 5/8 inches or les