Manufactured by Hitech & C Co. Ltd. of Korea Powerisers abide by stringent quality standards. The construction materials used for the Poweriser are of the highest quality. A genuine top quality jumping stilt available at an affordable price to the end user the Poweriser consists of a thick aluminum frame with a long lasting quality fiberglass leaf spring as the backbone. A twelve month general warranty (six months on Spring and Rod-D parts) serves as peace of mind for you our buyer that this outlay is worthwhile. An extreme exciting and interesting alternative sport ideal for good fun exercise or healthy competition. The Poweriser spring breaks down gradually with a controlled performance decrease and without any sudden dangerous breaks. Adult/Teen Powerisers allow you to jump 7 feet high and run 20 miles per hour. You must wear full safety equipment Advanced Model Improvements: The Knee cap has been modified to Knee cap cuffs. This is more convenient for users to tighten it and looks better. . Binding like board binding. . Knee cap holder is now Alumimum knee cap which is stronger and better supports Knee cuffs. The New knee cap holder does not need the Knee cap Pad. Special connection sets with high-quality metal tie-clips Sliding bearing for force saving and for more jump strength strengthened foot mounting plates self-locking nuts after German standard new knee mounting plate systems with highest stretcher comfort strengthened assembly of the rubber buffers new feather/spring shroud with high-strength plastic