Set up a temporary fence to outline a baseball or softball diamond or erect boundary lines around a playing field for various sports with these Markers Inc. 60 in Smart Poles with Sockets. Designed to hold up to intense outdoor conditions, these poles are made of high-strength polymer to maintain a strong barrier in the face of high-speed winds, downpours and other weather events. Fencing can be hung on the caps and sleeves, which allow the fence's tension to be adjusted to prevent sagging or slack.