Masters Waterproof Ball Marker Pens X 2 These pens will mark your golf ball permanently, aiding identification. They can be used on their own to make your own personal mark or in on junction with the Masters Align-M-Up ball alignment system. Pack contains two pens, one red, one black. Features: These pens will mark your golf ball permanently, aiding identification. They can be used on their own to make your own personal mark or in conjunction with the Masters Align-M-Up ball alignment system. Pack contains two pens, one red, one black Specifications: Dimensions: H:17.9 x W:11.6 x D:2.8 cm Model Number: GFA122