Colours may vary. Also known as French collar, Dominant Dog collar, Control collar, Training Collar. Training Collar with brass ring and a plastic toggle. The cord collar maintains its position on the dogs neck thanks to the fitted toggle making this a great training aid and allowing the handler to remain safely in control. Size guide: Sizes shown are maximum diameter when cord collar is fully extended. +/- 10mm. Please measure the largest part of your dogs head for the correct size. Sizes 15" and 17"- 4mm Sizes 20", 22", 24" and 28" -6mm We strongly recommend using safety line with all training collars https://www.vonwolfshop.co.uk/products/safety-line-adjustable-5 Recommended use of cord collars Cord collars are designed as a training aid and are not to be substituted for your regular collar. It is recommended to have two lines on your dog, one on the cord collar for corrections/reinforcements only and the second line attached to your regular collar/harness.