Amber Sporting Goods Speed/Agility Circles (Set of 12) These Agility Rings are a simple and effective tool for improving agility, quickness, coordination and reaction time. Also known as Agility Rings, agility dots or simply agility circles. Made of high impact pvc. Recommended for indoor use. Perfect conditioning tool for teaching all types of footwork drills. You can create your own foot pattern. Set contains 12 circles.