Caesar II Collar & Leash Collection We've updated the popular Caesar Collection with a stronger design that is also more durable. All we can say is "Hail Caesar"! Ribbon material on heavy nylon webbing with sturdy metal and plastic adjustable hardware. Collar sizes in inches: X-Small/Small is 1/2" x 10-16"; Medium/Large is 1" x 16-24". Harness sizes in inches is 1/2" x 8-14". Leash sizes: X-Small/Small is 1/2" x 4ft.; Medium/Large is 1" x 4ft. Our gorgeous metal buckles are now lighter weight! We have taken the beauty of polished metal and paired it with a light weight composite side release mechanism which reduces the weight of our buckle by over 50%. The side release is sturdy and easy to use. It doesn't have any components that can stick or stop working over time.