This 3 ring design enables the entire collar to decrease in size when pulled which evenly distributes pressure and eases strain. It also acts as a safety mechanism in that it prevents the choke from closing too tightly.

Sizes: 1.5 mm x 18", 20", 22" total lengths.

Sizing instructions: For training purposes you need at least 3-4" extra length. (Too big is better than too small.)