The New Benchmark for Strength, Durability, and Ease of Installation! The rod on the MAXXDuty pogo is made of fiberglass and eliminates the need for an internal spring. It has undergone extensive testing (over a half million cycles without signs of failure) and over a year of field trials in the harshest conditions with no signs of wear - that's 10 times longer than traditional pogos. Add to that the nylon polymer all-in-one hoop that allows for total flexibility in managing critical air, electrical and hydraulic lines, and it's easy to see why the MAXXDuty pogo is the new industry standard.