The 12 glue sticks that come with the Knot-Tec Wood Repair System are in four colors that blend with wood to create a form around knot holes which allows a woodworker to use that area of the board — sanding, painting or treating it as usual. A glue gun, with a plug adapted to the U.S., Australian or U.K., types, is part of the system, which sells for 57.24 British pounds sterling (approximately $98 U.S. dollars).