Ruffwear Knot a Collar Dog Collar. A collar that's perfect for any lifestyle! This collar by Ruffwear is made of a reflective rope that settles comfortably into fur and has sliding fisherman knots making this collar easy to adjust. Aluminum V-ring provides a secure leash attachment point while there's a separate attachment point for ID tags. Hand wash. Don't forget the matching leash!Sizing:14_20in: 14-20 in. L x 7 mm. diameter20_26in: 20-26 in. L x 7 mm. diameter