These are universal leading edge bladders you use with our U-STICK valves to assemble replacements for almost any kite ever made. Yeah….we invented ’em and we publish a handy dandy sizing chart for the most common kites. Click here to access our chart. Made right here in our own factory in the USA. The bladders are measured from end to end in feet. If you have your bladder out measure end to endl and choose whatever size is equal to or longer than your original (don’t you fudge on the measurement or you’ll get yourself in trouble). Or just check the sizing chart, we probably list your kite. You may also want to know what the difference is between our \