This belonged to my father, who cherished it. I'm passing it on to someone who will appreciate it. "TL Weight Flow" is a design philosophy that allows golfers to swing clubs stably by gradually adjusting the weight of the clubs for each club number. Specifically, it aims to create a consistent rhythm in the swing even when changing the club length by making longer clubs (such as drivers) lighter and shorter clubs (such as irons) heavier. Purpose of Weight Flow: Maintain a consistent feel: To keep the centrifugal force, etc., consistent when swinging clubs of different lengths, allowing you to swing with the same feeling with all clubs. Stable swing: Eliminates the need to change the swing for each club number, resulting in a stable swing.