This 7th top string hole is STX's new Channel Lock technology

high performance gear

but not so much that you lose the feel of the barrel

bat has never been hit with

Used Harbinger AB Carver Pro W/Knee Pads Ab Roller Exercise Wheel Black OSFA:Black This 7th top string holeUltra wide ab roller with built in resistance and ergonomic handles to help maximize results of ab roll out exercises Interior kinetic engine uses a carbon steel spring to provide resistance and amplify abdominal and arm workout Ultra wide wheel tread offers stability when carving left right or center for targeted work on obliques Ergonomic hand grips are angled to activate arm and core muscles handles are removable for easy storage and transport