The collar and the bracelet are made with real leather and cotton& poly cord. The collar has an unbreakaway 3/4 inch buckle with a 3/4 inch D ring on the side. The Bracelet is adjustable and can open to 8 inches or more.

MEASUREMENT: The sample measure in the picture for your reference.
Collar: 12" x 5/8 "
Bracelet: open to 8" x 3/8"