The Last Chance Archery Archer's Counter Mat is a 30” x 14” rubber-backed large counter mat loaded with archery tuning info, including how to measure FOC, an FOC overview, paper tuning tips, whitetail anatomy, common knots (i.e., how to tie d-loops, serving sets, and nock points), arrow wrap installation, measuring kinetic energy, standard bolt sizes, and more. In addition, these large mats are great for protecting your counter or table from scratching and for keeping screws and bolts from rolling around.