The 16A29 Flat Round Markers are designed for all types of training. The 16A29 Flat Round Markers can be used to set up boundaries of a field or grid. The ball rolls smoothly over the 16A29 Flat Round Markers. The gripped back of the 16A29 Flat Round Markers help prevent slippage on some surfaces. The 16A29 Flat Round Markers come in sets of 10 per color. The 16A29 Flat Round Markers are available in red, white, blue, or yellow.