PetSafe Spray Refill - Unscented - No-Mess Replacement Cartridges Spray Dog Bark Collar Remote Training Collar - Refill Cartridge Only - 3-Pack - PAC00-16646 - COMPATIBLE COLLARS: The PetSafe Spray Refill - Unscented is for use with the PetSafe Spray Bark and Training collars; it is NOT compatible with the PetSafe GentleSpray, Elite Big Dog and Little Dog Spray Bark Collars or Elite Big Dog and Little Dog Spray Trainers - EASY-TO-REPLACE: The refill cartridges are easy to replace; simply remove the empty cartridge and replace with the new refill cartridge - 100% RECYCLABLE: The disposable PetSafe Spray Refill cartridges are 100% recyclable - QUALITY PROMISE: PetSafe brand has been a trusted global leader in pet behavior, containment and lifestyle innovations since 1998 to help keep your pet healthy, safe and happy - NO REFILLS REQUIRED: Spray cartridges are replaceable and cannot be refilled