SportsEdge Throwing Circles for discus and shot put/hammer events are all IAAF, NCAA & NFHS regulation compliant. All circles are recessed type. The discus circles create an 8.2’ ring and the shot/hammer circles create a 7.0’ ring. All are made of aluminum and come in four bolt together quarter sections for easy shipment. Both sizes are available in three models; a simple circle, a circle with cross bracing and a cross braced circle with a 10’ x 10’ square form that also creates the pad.Shotput Toeboards are available in mill finish aluminum or white recycled rubber. They come in two heights; 3.5” for recessed pads and 4.0” for level pads. All of them bolt down to an existing concrete pad. RUBBER TOE BOARDSSE363R Rubber Shot Toe Board for Depressed PadMaterial: Recycled RubberHeight: 3.25”Provides phenomenal durability, easy installation, and safety. Finished with White UV Resistant Paint.SE364R Rubber Shot Toe Board for Level PadMaterial: Recycled RubberHeight: 4.0”Provides phenomenal durability, easy installation, and safety. Finished with White UV Resistant Paint.ALUMINUM TOE BOARDSSE3631 Aluminum Shot Toe Board for Depressed PadMaterial: 3/16” Aluminum 5052-H32Height: 3.25”Finished with White UV Resistant Paint.SE3641 Aluminum Shot Toe Board for Level PadMaterial: 3/16” Aluminum 5052-H32Height: 4.0”Finished with White UV Resistant Paint.