This custom prong collar is designed to make your training collar easier than ever before with this heavy duty quick release buckle. We only use the top of the line prong collar brand, Herm Sprenger! This collar is made with 2.25mm sized prongs and is one standard size (Length - 16 inches, Neck Size 14 inches). **If you need extra links for a larger dog neck, you will need to purchase them online**