The Junior Pro-Jump F-Series Lower Spring Bracket features the following specifications... Suitable For - The Junior Pro-Jump F-Series Lower Spring Bracket is designed to fit the Junior Pro-Jump F-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 Junior Pro-Jump F-Series Lower Spring Bracket is supplied Fittings not included