Designed to make camp life easier and available in two sizes, CamRing Cord Tensioners have a ring design that securely tensions your cord yet adjusts easily, eliminating the hassle of tying and retying knots in cold or wet weather. The small-size cord tensioners lock securely and perform best on cords from 1.5mm to 3mm. The large-size cord tensioners have an ultralight, non-slip design that grips 3-5 mm cord.