Canadian Brand. The Open Range Esophagus Wrapped Collagen Bully Stick iscrafted from 100% pure beef collagen and enveloped in esophagus. Its appearance mirrors that of a Pizzle Bully Stick. Dogs cant resist its rich beefy flavor! With a chew consistency similar to a Pizzle Bully Stick and high digestibility, it's poised to be the next big thing in Bully Sticks!