i think its more like if you tried to drag your friend around by his ankle. then put your friend on a sled and drag him around. the sled does have more contact area but will slide easier.Doesn't such sleeve add more friction compared to two separate narrow glide rings? I mean such sleeve has more contact surface.. Of course standard glide rings suck. Mine BAR10 even scratched teflon cylinder. But decent material glide rings look superior.