The Trigon Sports Pro Turf On-Deck Circles with Foam Backing are constructed of top quality spike-proof turf with a 5mm shock absorbing cushion. This set of two standard green round turfs comes in a choice of sizes. About Trigon Sports Located in Memphis, TN, Trigon Sports is family owned and specializes in the direct importation and distribution of team sports equipment. Providing the essentials for every level of play from Little League to the Big Leagues, Trigon Sports is well known for their exclusive line of ProCage™ branded sports equipment, which features the industry's best protective screens and batting tunnel nets. Trigon has expanded the focus of its product line from baseball/softball to include all major team sports, including basketball, soccer, volleyball, tennis, track & field, and speed & agility training.