Portolite On Deck CirclesPortolite On Deck Circles Step into your power zone with the resilience and reliability of Portolite's SpikeTek On Deck Circles. Approved for outdoor use, and available in various sizes, these on deck circles are the pride of American craftsmanship. SpikeTek with over 600 spikes will grip any synthetic turf or dirt field Sloped edges will never fray or curl Heavy duty design prevents tears and abrasions. 3 4 inch (. 520) woven polyethylene turf