Now this is something that we've never seen before! Leading up to the 2013 US Open at Merion Golf Club, these patches of synthetic turf were carried by caddies and used for play at the course in order to not make any divots on the course in preparation for the US Open. There are 3 holes in the turn where tees could be placed to secure it in place during a golf shot. These pieces of synthetic turf were used on tee shots and all subsequent shots until the player reached the green! This piece of Merion Golf Club 2013 US Open prep turf measures approximately 6" x 12".