The Junior Pro-Jump C-Series Mid Spring Bracket 50 to 60kg features the following specifications... Suitable For - The Junior Pro-Jump C-Series Mid Spring Bracket 50 to 60kg is designed to fit the Junior Pro-Jump C-Series bouncy stilts as a replacement part. It will fit C50 and C60 C-Series stilts fitted with a spring with a strength rating from 50 to 69 kg (see the very bottom end of the spring). 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 C-Series Mid Spring Bracket 50 to 60kg is supplied Fittings not included