Type:Martingale Pet Dog Training Collars for Large and Extra Large Dogs Material:High quality nylon & chrome chain. Apply for:Training and Walking dogs Fit for large, extra large dogs,e.g.Pitbull,Golden Retrieer,German Shepherd,Rottweiler,Labrador,etc. 4 Colors availble Package Include:1xDog Martingale Collar Feature: Convenience adjustable. Limited closure helps to prevent injury to pets Heavy duty dog collars,high quality,durable and soft. Alloy metal:Wear-resistant,Strong and Durable,Do not rust 2 Size: XL: 55-65cm(22-26") neck adjustable,15mm diameter XXL: 60-70cm(24-28") neck adjustable,18mm diameter Note: Please measure the neck size of your pet before ordering.That's very important! Please allow 0.5-1 inch(1-3cm) error due to manual measurement.