FULL COURT REPRESENTATION: Markers including 4 corners, and 8 straights, will indicate edges of the service boxes, baselines, and sidelines of a tennis court. DURABLE CONSTRUCTION: Weighted to stay down if you step on the lines or if the wind picks up. EASY SET-UP: Drop placement of markers work well for both indoor and outdoor courts. NON-MARKING TEMPORARY LINES: Great to use on the road or at home to avoid paint and tape.