Just to bump this thread a bit, I have a put 2 sets of the sliders on my kites to replace the rings.
Will get back seeing how they affect wear after a few while.
(if you have epic rings on your kites 'SaveTheWhales' I highly suggest getting rid of them)
photo showing them directly compared, going to estimate the surface area for the slider is a great deal higher, guestimating around 5x more =]
PS. postage is cheap if you buy more kites, not a good circle to be in!