Wikipedia
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The Vurtego is a variation of the traditional pogo stick.
The Vurtego pogo forfeits the traditional spring design in exchange for an air spring system. The air spring allows riders to reach great heights without the requirement of a heavy spring or elastomeric bands, which degrade over time. The Vurtego weighs under 11 pounds (5 kg) yet is capable of producing 1500 pounds-force (8,000 newtons) of thrust. The Vurtego allows riders to propel themselves as high as 10' 6".
In 2008 Vurtego released a new version of the Vurtego, the 'V2.' The V2 is similar to the V1, except the shaft is rotated 45 degrees, adding strength. The pegs are larger and curved a bit at the bottom. There is a less expensive version of the V2, known as the 'power pogo', which boasts the same performance as the V2, but is made in China with cheaper material. Another version known as the V2 'Fit' is, as the name suggests, for exercise. The V2 comes in three sizes; Small [riders 5'0"-5'6"], Medium [5'4"-6'0"], and Large [5'10"+].
The next edition to the Vurtego series became available right before New Years. It is known as the 'V3'. It is similar to a V2 but has an aluminum tube and a new boltless air piston. There are two versions, the standard V3 [grey anodized aluminum] and a black version known as the 'V3 Stealth'. The stealth version features an all black anodized aluminum tube and footpegs with the same performance as the standard V3. The V3 comes in the three sizes.
The newest model is the V4 and the V4 Pro. Instead of keeping the spacer and piston separated, Vurtego combines the 2 adding additional air space. Along with that they curved their bounce tip into a dome shape to equalize the surface area of the jump no matter what angle you bounce at. As well as landing length to the slide shaft. "A specially formulated powder coating is applied to our Traction Pegs, providing a griptape-like feel to ensure that your feet stay locked in place on the pogo stick at all times." The cylinder undergoes minor changes including an excursion process and an anodizing process. The bushing was redone to "reduce friction by 40%." The V4 pro's bushing has 4 holes to add lubrican. The V4 pro's slide shaft is also longer than the V4. The V4 and V4 pro comes in 2 color (unless you want it custom painted), white for the V4, green for the V4 pro. The V4 and V4 pro also comes in 3 sizes. Small, Medium and large.