15 K9 Collars bells come in the refill box.  There is NO Display crate included.  Your cuatomers will be able to hear thier dogs when they can't see them.  Snap the bell onto the collar or harness, no need to take the collar off the dog.  The bridle leather is strong and soft. The brass bell is loud and easily heard from a long distance.  A must when in the woods, fields or park.  Also useful on saddles and people during hunting season.  Each bell costs$7.50