Feature●Titan extra link conveniently provide additional sizing options●Made of chrome plated steel●Use for the pinch link training collar●Available in medium size●Measures 3.0-mm diameter; includes 3 links per packDescription Coastal Pet Titan extra link conveniently provide additional sizing options for the pinch link training collar. Made of chrome plated steel. Available in medium size. Measures 3.0-mm diameter. Includes 3 links per pack.