They are produced in a super slick, hard grade polymer that slides beautifully on monofilament, the clip link is easy to open and is masked by exactly the right length of silicone tube to prevent tangles. The three sizes are designed to work perfectly with  and 

Run Rings offer a free running setup perfect for fishing targeting a variety of species such as barbel, chub, carp, bream, tench and even perch and eels.

Each pack comes with four green and four brown Run Rings and are available in three sizes ranging from small to large.