StarMark Training Collar, Large, Black Quality and performance driven products for your pet Tested for safety and health Provide a better quality of living for your pet with Starmark Helps train your dog gently and effectively High-strength link design fits together in watchband pattern 20-inch circumference fits larger dogs Links can be removed or added (additional links sold separately) Created by certified experts at Triple Crown Dog Academy, Inc. Helps train your dog gently and effectively High-strength link design fits together in watchband pattern 20-inch circumference fits larger dogs Links can be removed or added (additional links sold separately) Created by certified experts at Triple Crown Dog Academy, Inc.