Slightly heavier “licorice” speed ropes when your program needs the fastest rotating and highest quality jump ropes. Extra durable PVC material is 3/16” in diameter with shatter-proof handles. ExerRopes™ are alternating black-and-white striped, are wrinkle and kink-free, and the 4.5” long handles are shatterproof. Handle color designates length; unconditional 2 year guarantee.