The gapping chart has 3 columns and 13 rows so you can fill in carry and total distances for all 13 of your clubs. A special writable surface allows you to write on it with a ball point pen although for the best result we recommend an ultra fine point permanent marker (note: the product image uses a black fine point permanent marker). Featuring a faux leather strap for attaching the chart to a golf bag or wherever is convenient you can have your distances when you need them. Ready to take a club out of your bag? Check your gapping chart for the perfect club first!