Loudmouth Captain Thunderbolt USA Oversized Putter Grip with Matching Ball Marker High performance putter grip with tour driven quality & feel Patented grip end cap design allows for easy 'slide' removal of built in ball-marker during play USGA and R&A rule conforming with grips in play on professional tours worldwide Powerful, rare earth neodymium magnet built into retaining walls of grip end cap to ensure functionality and ease of player use on the greens Additional ball-markers not required but available if desired