CLOSEOUTS . Ruff Wear's Knot-A-Collar is not a traditional collar... it's better. The highly adjustable sliding knot system stays in place when attached to your leash, but is designed to slip off when caught or snagged. 7 mm nylon rope is strong and lightweight Sturdy, solid leash ring Split ring tag attachment CLOSEOUTS . Vietnam. Size: S(9-19â) L(17-29â)