These DPN holders use thick, durable elastic and wide rubber caps so that any project and most sizes of knitting needles fits into them. The elastic stretches to fit over your needles without putting too much pressure on them, protecting the tips from catching on whatever else you're carrying around.
Please note that the listed lengths are not the measurements of the DPN holder - they are the length of needle that the holder will comfortably fit over.
The red 5" DPN holder is made for short sock needles.
The blue 6" DPN holder is what most needles fit into. These hold sleeve or hat knitting needles.
The yellow 7" DPN holders are the largest size.