One set, two heights. A simple twist locks each hurdle at 6 inches or 12 inches, so a single 4 pack covers fast-feet work and higher plyometric jumps without carrying two sets. The two-tone design does real coaching work: set the yellow-top pair at one height and the blue-top pair at another, call the color, and players read the drill at a glance. Hinge design packs flat, and the included carry bag makes the set easy to store and transport.