Ruffwears Chain Reaction Collar provides limited correction with an audible cue, making it perfect for controlled leash training. Martingale-style collar is crafted of TubeLok webbing and a short section of stainless steel chain with a leash-attachment point that provides the audible correction. An additional V-ring attachment point allows use as a standard collar. ID attachment point with silicone tag silencer for reduced tag jingle. Quick Ring which allows you to easily add and remove tags. Integrated reflectivity enhances low-light visibility. Sizes: S (11-14 neck), M (14-20 neck), L (20-26 neck). Colors: Grey, Green, Purple, Red. Type: Collars.