The Adult Pro-Jump M-Series Narrow Plastic Shock Absorber features the following specifications... Suitable For - The Adult Pro-Jump M-Series Narrow Plastic Shock Absorber is designed to fit the Adult Pro-Jump M-Series bouncy stilts as a replacement part Compatible With - This part MAY also be compatible with other brands of Powerbocks (however we can not guarantee this) including PoweriZer, PowerStrider, Fly Jumper, Jolly Jumper, Air Trekker, Air Runner, Speed Jumper, PowerStrider, 7 League Boots, PowerSkip and PoweriSer. If you are unsure after checking the photos and description, the Pro-Jump Forum (search Google) may be able to advise if you post photos of your Jumping Stilts. Quantity Supplied - One Adult Pro-Jump M-Series Narrow Plastic Shock Absorber is supplied Fittings not included