The Herm. Sprenger® Extra Links for Dog Prong Collars may be added or removed for the proper fit. Available in a pack of three. Sophisticated production techniques, consistent quality control, superb craftsmanship and the highest quality raw materials make Herm. Sprenger German chain products superior. Herm. Sprenger® offers a variety of high-quality, specialty chain products. Features: *Pack includes three replacement links for the Herm. Sprenger Prong Dog Training Collars. *Easily attaches to the collar links to add length and get a more custom fit. *Blunt prongs are designed to be safe and effective without hurting your dog. *Made with superb craftsmanship from high-quality raw materials. *Great for walking strong pullers and large dogs, or during obedience training. Applications Safe, effective dog training tools with proper use.