The Flat Round Markers are designed for all types of training. The Flat Round Markers can be used to set up boundaries of a field or grid. The ball rolls smoothly over the Flat Round Markers. The gripped back of the Flat Round Markers help prevent slippage on some surfaces. The Flat Round Markers come in sets of 10 per color. The Flat Round Markers are available in red, white, blue, or yellow.